MessageParser: Prevent duplicated response if supybot.databases.plugins.channelspecific is enabled.
Fix previous commit. Thanks to Nothing4You.
setup.py: Add the --debug switch.
setup.py: In debug mode, display 2to3 logs.
2to3/run.py: Fix compatibility issue with old Python 3.x versions (2to3 does not suport -W and -o).
Fix previous commit.
Socket: Fix compatibility with Python 3.1.