- Added test testgdalraster.in which properly tests the output of ST_AsGDALRaster.  This test makes use of rtgdalraster.py found in raster/scripts/python, which itself requires psycopg2.
- Refactored rt_asgdalraster.sql, rt_astiff.sql, rt_asjpeg.sql and rt_aspng.sql to no longer attempt to validate the output of the respective functions with an MD5 checksum but rather be a test of the functions' behaviors.


git-svn-id: http://svn.osgeo.org/postgis/trunk@7235 b70326c6-7e19-0410-871a-916f4a2858ee