Addition of ST_AddBand(raster, ...) for out-db bands. Ticket #2276

git-svn-id: http://svn.osgeo.org/postgis/trunk@11311 b70326c6-7e19-0410-871a-916f4a2858ee
Added bash versions of "bootstrapping" code for rt_addband test

git-svn-id: http://svn.osgeo.org/postgis/trunk@11312 b70326c6-7e19-0410-871a-916f4a2858ee
Explicitly initialize memory as valgrind complains

git-svn-id: http://svn.osgeo.org/postgis/trunk@11313 b70326c6-7e19-0410-871a-916f4a2858ee