Implement RFC 2: Initial integration of "GDAL SRS barn" work

This work mostly consists of:
- a C++ implementation of the ISO-19111:2018 / OGC Topic 2
  "Referencing by coordinates" classes to represent Datums,
  Coordinate systems, CRSs (Coordinate Reference Systems) and
  Coordinate Operations.
- methods to convert between this C++ modeling and WKT1, WKT2
  and PROJ string representations of those objects
- management and query of a SQLite3 database of CRS and Coordinate Operation definition
- a C API binding part of those capabilities

This is all-in-one squashed commit of the work of
https://github.com/OSGeo/proj.4/pull/1040

1 files changed, 57 insertions, 0 deletions

diff --git a/data/sql/ellipsoid.sql b/data/sql/ellipsoid.sql
new file mode 100644
index 00000000..660914a5
--- /dev/null
+++ b/data/sql/ellipsoid.sql
@@ -0,0 +1,57 @@
+--- This file has been generated by scripts/build_db.py. DO NOT EDIT !
+
+INSERT INTO "ellipsoid" VALUES('EPSG','1024','CGCS2000',NULL,'PROJ','EARTH',6378137.0,'EPSG','9001',298.257222101,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','1025','GSK-2011',NULL,'PROJ','EARTH',6378136.5,'EPSG','9001',298.2564151,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','1026','Zach 1812',NULL,'PROJ','EARTH',6376045.0,'EPSG','9001',310.0,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7001','Airy 1830',NULL,'PROJ','EARTH',6377563.396,'EPSG','9001',299.3249646,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7002','Airy Modified 1849',NULL,'PROJ','EARTH',6377340.189,'EPSG','9001',299.3249646,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7003','Australian National Spheroid',NULL,'PROJ','EARTH',6378160.0,'EPSG','9001',298.25,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7004','Bessel 1841',NULL,'PROJ','EARTH',6377397.155,'EPSG','9001',299.1528128,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7005','Bessel Modified',NULL,'PROJ','EARTH',6377492.018,'EPSG','9001',299.1528128,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7006','Bessel Namibia',NULL,'PROJ','EARTH',6377483.865,'EPSG','9001',299.1528128,NULL,1);
+INSERT INTO "ellipsoid" VALUES('EPSG','7007','Clarke 1858',NULL,'PROJ','EARTH',20926348.0,'EPSG','9005',NULL,20855233.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7008','Clarke 1866',NULL,'PROJ','EARTH',6378206.4,'EPSG','9001',NULL,6356583.8,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7009','Clarke 1866 Michigan',NULL,'PROJ','EARTH',20926631.531,'EPSG','9003',NULL,20855688.674,1);
+INSERT INTO "ellipsoid" VALUES('EPSG','7010','Clarke 1880 (Benoit)',NULL,'PROJ','EARTH',6378300.789,'EPSG','9001',NULL,6356566.435,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7011','Clarke 1880 (IGN)',NULL,'PROJ','EARTH',6378249.2,'EPSG','9001',NULL,6356515.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7012','Clarke 1880 (RGS)',NULL,'PROJ','EARTH',6378249.145,'EPSG','9001',293.465,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7013','Clarke 1880 (Arc)',NULL,'PROJ','EARTH',6378249.145,'EPSG','9001',293.4663077,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7014','Clarke 1880 (SGA 1922)',NULL,'PROJ','EARTH',6378249.2,'EPSG','9001',293.46598,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7015','Everest 1830 (1937 Adjustment)',NULL,'PROJ','EARTH',6377276.345,'EPSG','9001',300.8017,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7016','Everest 1830 (1967 Definition)',NULL,'PROJ','EARTH',6377298.556,'EPSG','9001',300.8017,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7018','Everest 1830 Modified',NULL,'PROJ','EARTH',6377304.063,'EPSG','9001',300.8017,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7019','GRS 1980',NULL,'PROJ','EARTH',6378137.0,'EPSG','9001',298.257222101,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7020','Helmert 1906',NULL,'PROJ','EARTH',6378200.0,'EPSG','9001',298.3,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7021','Indonesian National Spheroid',NULL,'PROJ','EARTH',6378160.0,'EPSG','9001',298.247,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7022','International 1924',NULL,'PROJ','EARTH',6378388.0,'EPSG','9001',297.0,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7024','Krassowsky 1940',NULL,'PROJ','EARTH',6378245.0,'EPSG','9001',298.3,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7025','NWL 9D',NULL,'PROJ','EARTH',6378145.0,'EPSG','9001',298.25,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7027','Plessis 1817',NULL,'PROJ','EARTH',6376523.0,'EPSG','9001',308.64,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7028','Struve 1860',NULL,'PROJ','EARTH',6378298.3,'EPSG','9001',294.73,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7029','War Office',NULL,'PROJ','EARTH',6378300.0,'EPSG','9001',296.0,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7030','WGS 84',NULL,'PROJ','EARTH',6378137.0,'EPSG','9001',298.257223563,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7031','GEM 10C',NULL,'PROJ','EARTH',6378137.0,'EPSG','9001',298.257223563,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7032','OSU86F',NULL,'PROJ','EARTH',6378136.2,'EPSG','9001',298.257223563,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7033','OSU91A',NULL,'PROJ','EARTH',6378136.3,'EPSG','9001',298.257223563,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7034','Clarke 1880',NULL,'PROJ','EARTH',20926202.0,'EPSG','9005',NULL,20854895.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7035','Sphere',NULL,'PROJ','EARTH',6371000.0,'EPSG','9001',NULL,6371000.0,1);
+INSERT INTO "ellipsoid" VALUES('EPSG','7036','GRS 1967',NULL,'PROJ','EARTH',6378160.0,'EPSG','9001',298.247167427,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7041','Average Terrestrial System 1977',NULL,'PROJ','EARTH',6378135.0,'EPSG','9001',298.257,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7042','Everest (1830 Definition)',NULL,'PROJ','EARTH',20922931.8,'EPSG','9080',NULL,20853374.58,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7043','WGS 72',NULL,'PROJ','EARTH',6378135.0,'EPSG','9001',298.26,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7044','Everest 1830 (1962 Definition)',NULL,'PROJ','EARTH',6377301.243,'EPSG','9001',300.8017255,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7045','Everest 1830 (1975 Definition)',NULL,'PROJ','EARTH',6377299.151,'EPSG','9001',300.8017255,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7046','Bessel Namibia (GLM)',NULL,'PROJ','EARTH',6377397.155,'EPSG','9031',299.1528128,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7047','GRS 1980 Authalic Sphere',NULL,'PROJ','EARTH',6370997.0,'EPSG','9001',NULL,6370997.0,1);
+INSERT INTO "ellipsoid" VALUES('EPSG','7048','GRS 1980 Authalic Sphere',NULL,'PROJ','EARTH',6371007.0,'EPSG','9001',NULL,6371007.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7049','IAG 1975',NULL,'PROJ','EARTH',6378140.0,'EPSG','9001',298.257,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7050','GRS 1967 Modified',NULL,'PROJ','EARTH',6378160.0,'EPSG','9001',298.25,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7051','Danish 1876',NULL,'PROJ','EARTH',6377019.27,'EPSG','9001',300.0,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7052','Clarke 1866 Authalic Sphere',NULL,'PROJ','EARTH',6370997.0,'EPSG','9001',NULL,6370997.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7053','Hough 1960',NULL,'PROJ','EARTH',6378270.0,'EPSG','9001',297.0,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7054','PZ-90',NULL,'PROJ','EARTH',6378136.0,'EPSG','9001',298.257839303,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7055','Clarke 1880 (international foot)',NULL,'PROJ','EARTH',20926202.0,'EPSG','9002',NULL,20854895.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7056','Everest 1830 (RSO 1969)',NULL,'PROJ','EARTH',6377295.664,'EPSG','9001',300.8017,NULL,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7057','International 1924 Authalic Sphere',NULL,'PROJ','EARTH',6371228.0,'EPSG','9001',NULL,6371228.0,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7058','Hughes 1980',NULL,'PROJ','EARTH',6378273.0,'EPSG','9001',NULL,6356889.449,0);
+INSERT INTO "ellipsoid" VALUES('EPSG','7059','Popular Visualisation Sphere',NULL,'PROJ','EARTH',6378137.0,'EPSG','9001',NULL,6378137.0,1);