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, 6 insertions, 2 deletions

diff --git a/travis/after_success.sh b/travis/after_success.sh
index 8a230693..2ae34bc8 100755
--- a/travis/after_success.sh
+++ b/travis/after_success.sh
@@ -2,8 +2,12 @@
 
 set -e
 
-# coveralls falsely reports .c-files in the build directories as having 100% coverage so we exclude them
-coveralls --extension .c --exclude build_autoconf --exclude build_cmake
+
+if [ "$BUILD_NAME" != "linux_clang" ]; then
+    # coveralls falsely reports .c-files in the build directories as having 100% coverage so we exclude them
+    coveralls --extension .c --exclude build_autoconf --exclude build_cmake
+fi
+
 echo "$TRAVIS_SECURE_ENV_VARS"
 ./travis/build_docs.sh
 # Only build and publish docs when changes are made on most recent maintenance branch