EUPS source full of staticmethod workarounds

[timj]

I've just noticed that the EUPS source files are full of this construct:

    # @staticmethod   # requires python 2.4
    def canHandle(source):
        return False;
    canHandle = staticmethod(canHandle)  # should work as of python 2.2

Now that we only support 2.6 and newer it would seem that a clean up pass would be very useful to remove all the old cruft. This would make the code more readable.