WMS: fix to make GDAL_DEFAULT_WMS_CACHE_PATH configuration option work as expected (#4540)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27554 f0d54148-0727-0410-94bb-9a71ac55c965
gdal_calc.py: fix documentation about default value for A_band option

git-svn-id: https://svn.osgeo.org/gdal/trunk@27556 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx