PROJ/travis/osx/install.sh, branch 7.1.0

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

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

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 :-)

CI environment: adapt for C++11 capable environments

2018-05-30T09:48:28+00:00

Add -std=c89 to travis targets.

2017-12-17T17:56:38+00:00

The multistresstest code has been made C89 compliant in the process.

travis/install.sh: use super pedantic warning flags for autoconf build

2017-02-26T11:32:44+00:00

.travis.yml: add multi config setup

2017-01-19T12:15:13+00:00

Setup 4 configs: Linux/GCC, Linux/CLang, OSX CLang and mingw32
OSX allowed to fail, since it fails in the proj -VC step.