OSR: add a variety of linear units to proj4 parsing, #5370

git-svn-id: https://svn.osgeo.org/gdal/trunk@26902 f0d54148-0727-0410-94bb-9a71ac55c965
OSR: test variety of linear units to proj4 parsing, #5370

git-svn-id: https://svn.osgeo.org/gdal/trunk@26903 f0d54148-0727-0410-94bb-9a71ac55c965