Allow a GEOM class to unload if it has no geoms or a method function to get rid of them.
Allow a GEOM class to unload if it has no geoms or a method function to
get rid of them.

Prodded by:	pjd

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase