Add support for raster tile index with tiles of mixed SRS (TILESRS keyword)
Shapefile (vector layers or tileindex): PROJECTION AUTO in a shapefile layer now causes reading the .prj file
Remove useless orig_tilesrs field in layerObj struct
Correct test to resolve PROJECTION AUTO in msSHPLayerOpen() is '#if defined(USE_GDAL) || defined(USE_OGR)'
Merge branch 'master' into raster_tileindex_with_mixed_srs

Conflicts:
	maplexer.c
Regenerate maplexer.c
update msautotest to latest revision of raster_tileindex_with_mixed_srs
Update msautotest to latest raster_tileindex_with_mixed_srs revision