- added rt_band_reclass and rt_raster_replace_band to rt_core/rt_api.c and rt_api.h
	- added test case to test/core/testapi.c
	- added RASTER_reclass to rt_pg/rt_pg.c
	- added SQL functions for ST_Reclass
	- added regression tests

Associated ticket is #903


git-svn-id: http://svn.osgeo.org/postgis/trunk@7154 b70326c6-7e19-0410-871a-916f4a2858ee