VMM/pycompat: added function any() for Python 2.4

replaced some "for x in list …"

VMM/Domain: get_gid() return 0 instead of raising an Exception, if the domain wasn't found in the database.

VMM/Alias: renamed Alias.add_destination() to add_destinations(). Now it's possible to add one ore more destinations to the alias with a single method call. VMM/Handler: adjusted Handler.aliasAdd() to the API changes of the Alias class. Also use get_gid from the Domain module to get the gid of a domain. We don't need complete Domain object, only the gid. Handler.getWarnings(): no longer return the __warnings list. Return a copy instead and empty the Handler.__warnings list.

doc: Added the alias documentation.

VMM/pycompat: added to the repository. Provides all() for Py24.

VMM/EmailAddress: implemented EmailAddress.__hash__(). So we can have a set() of EmailAddress instances.

VMM/cli: small optimizations in the functions w_std() and w_err()

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.