[RFC][python] Add support for commands implemented in Python

[Tom Tromey]

>>>>> "Thiago" == Thiago Jung Bauermann <bauerman@br.ibm.com> writes:

Thiago> Tromey worked on them, here's a new version which addresses
Thiago> your comments and Daniel's. I also changed cmdpy_function and
Thiago> cmdpy_completer to convert the command arguments to a Unicode
Thiago> string instead of an 8-bit Python string.

The code bits are ok.

thanks,
Tom