the Idle debugger.
M PyShell.py : Call RemoteDebugger.close_remote_debugger()
M RemoteDebugger.py: Add close_remote_debugger(); further polish code used
to start the debugger sections.
M rpc.py : Add comments on Idlefork methods register(), unregister()
comment out unused methods
M run.py : Add stop_the_debugger(); polish code
Use a repr() on the subprocess side when fetching dict values for stack.
The various dict entities are not needed by the debugger GUI, only
their representation.