Standardize absence of "object" prefix.

The set of "objects" returned from msg2objects is inconsistent.  Some processors prefix their objects with their own ``__name__`` or "modname" and others do not.

Here we standardize it so that all processors return their objects with no prefix.  It doesn't really matter if there is a prefix or not, just so long as they are consistent.

The "objects" sets are used primarily for gource visualization and are not very important.