instead of adding an extra CMakeLists in .ci/travis/code_layout to build API doc, astyle and run tests (indentation, spelling, sip, doc coverage), the top CMakeLists has been adapted to allow not building core libraries and possibly just the static code layout
* astyle has been moved from /src/astyle to /lib/astyle (I would propose to move all external libraries, and possibly add git submodules)
- Any test needing access to QGIS_DATA_SUBDIR (srs.db, svg, etc.) was looking for Resources in the bundled app instead
- This included failure for any call to qgscoordinatereferencesystem.cpp using srs.db and when locating svg icons
- Does not fix QGIS_DATA_SUBDIR in Python tests
- Subtests that were failing, as above, within a given test are still not triggering a fail for the test
- Symlink to grass and sqlanywhere frameworks created just for testing