1. Stake Freddy.

e.g. further improve subprocess interrupt, exceptions, and termination.
2. Remove the workarounds in PyShell.py and ScriptBinding.py involving
   interrupting the subprocess prior to killing it, not necessary anymore.
3. Fix a bug introduced at PyShell Rev 1.66: was getting extra shell menu
   every time the shell window was recreated.

M PyShell.py
M ScriptBinding.py
M rpc.py
M run.py