PROJ/travis/mingw32, branch 6.3.1

Upgrade testing from trusty to xenial, and also:

2019-09-25T08:50:07+00:00

* From openjdk-7 via apt to openjdk-11 via Travis CI xenial's $JAVA_HOME
* From mingw 4.8 -> 5.3, as supported by xenial
* clang+llvm for csa kept at version 6.0.0, but for ubuntu-16.04
* Furthermore xenial implicitly has many upgrades, specifically:
  - gcc 4.8.4 -> 5.4.0
  - clang 4.0.0 -> 5.0.0
  - cmake 3.9.2 -> 3.12.4
  - python 3.4.3 -> 3.5.2
* cppcheck version kept at 1.61 (for trusty) due to many
  false positives with version 1.72 (for xenial)
* Community code contribution documentation simplified to remove
  version of cppcheck, as this may outdated with updates to scripts

Rearrange Travis CI scripts to be more modular

2019-09-24T23:16:27+00:00

* Split global before_install for apt and pip
* Use -qq option for apt-get, which implies -y
* Use list of targets with apt-get rather than one-per-line
* Use local variables for mingw32/install.sh
* Show version info for cppcheck, pip and python
* Simplify clang+llvm-6 path

Travis: add testing of JSON output against schema and upgrade everything to Python3

2019-07-07T22:05:01+00:00

Use HTTPS URLs for download.osgeo.org

2019-06-21T11:39:01+00:00

Change all occurrences with the command below.

    git grep -l http://download.osgeo.org/ | xargs sed -i 's,http://download.osgeo.org/,https://download.osgeo.org/,g'

Fixes: https://github.com/OSGeo/PROJ/issues/1521

autoconf build: add a PROJ_DB_CACHE_DIR trick to speed-up builds

2019-04-28T20:09:03+00:00

If the PROJ_DB_CACHE_DIR environment variable is defined, then a
$(PROJ_DB_CACHED_DIR)/proj.db.sql.md5 file is used to determine if
the set of .sql files has changed since the last time. If not then
$(PROJ_DB_CACHED_DIR)/proj.db is directly used.
This can saved a few seconds when doing rebuilds.
This is a poor man equivalent of ccache for generating the database :-)

Adjust test outputs

2019-04-05T04:47:15+00:00

 - Tests should use unified diff with expected results
 - Show CMake build compile commands (VERBOSE=1)
 - Travis CI only has two cores, so "-j2" is sufficent

CI: Install cross-compiled sqlite3 to cross directory.

2019-02-05T03:52:54+00:00

autoconf / cmake: build test/ only if needed

2018-11-15T12:51:03+00:00

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

2018-11-14T21:48:29+00:00

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

Rename nad/ directory as data/

2018-09-18T20:58:57+00:00