[Zope-Coders] removing more Zope decoys

[Jeremy Hylton]

I'm looking around the tops of my current Zope checkout looking for
decoys.

I think the following files could be removed or moved without any loss
of functionality:

Setup15
Setup20
Main.py
dcdb.py

Move ts_regex.py to StructuredText package, as it is the only use of
it.

xmlrpclib.py is now in the Python std library, so it should go.

Jeremy