Added a modified version of Carl Anderson <carl.anderson@vadose.org> patch for

Added a modified version of Carl Anderson <carl.anderson@vadose.org> patch for
schema-aware find_srid().

I have modified your schema-patched find_srid() and commited it to the postgis

1. removed isstrict qualification and explicity throw an error if one of the
arguments is null
2. use "LIKE" instead of "~" for pattern matching because "~" wasnt working on
my system
3. throw an error if the the requested geometry couldnt be found.

git-svn-id: http://svn.osgeo.org/postgis/trunk@274 b70326c6-7e19-0410-871a-916f4a2858ee