gdaltindex: add -src_srs_name and -src_srs_format to go with MapServer RFC100; add also a -f and -lyr_name options to be able to create a non-shapefile tileindex

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@26173 f0d54148-0727-0410-94bb-9a71ac55c965
Add the wcs_virtds_params.py sample utility to be able to set the MapServer WCS virtual dataset parameters from a tileindex with rasters of mixed SRS (linked to MapServer RFC100)

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@26174 f0d54148-0727-0410-94bb-9a71ac55c965