-Fix for ticket 792: Clamp double to known values when pixeltype is other than double in rt_band_set_nodata, rt_band_set_pixel & rt_raster_generate_new_band
-Added function name to many error messages
-Standardized the way we write "nodata" from "NODATA" to "nodata"
-Moved some documentation to the header file
-My editor remove a lot of trailing space and convert tab to 4 spaces. Please make your editor do the same.
-Removed declarations of many unused variable


git-svn-id: http://svn.osgeo.org/postgis/trunk@6920 b70326c6-7e19-0410-871a-916f4a2858ee