Moved VirtualMailManager/Exceptions to VirtualMailManager/errors. Renamed VMM*Exception classes to *Error. No longer add the attribute 'message' to VMMError if it doesn't exist, like in Python 2.4. It has been deprecated as of Python 2.6. Also removed the methods code() and msg(), the values are now accessible via the attributes 'code' and 'msg'.

PEP-8-ified the work of the last days. Renamed methods in class Alias: addDestination() -> add_destination() delDestination() -> del_destination() getDestinations() -> get_destinations() Renamed methods in class Relocated: setDestination() -> set_destination() getInfo() -> get_info() Renamed VMM/constants/VERSION.py -> VMM/constants/version.py Adjusted relevant parts of the documentation.