Tweaking rate-limiting, added getattr command.

Fine-tuning self.admin.handlingcount checks/balances.
Added getattr command for admins to retrieve a raw attribute
from CommandFuncs and any children.
Started tests for pyval_commands. Added !setattr.

Started a little test suite for pyval_commands.py.

Added !setattr command to CommandFuncs. It allows the
admin to set any basic attribute on admin, commandhandler, and
commandfuncs.