use getattr to get the function by name

    -do not have an argument for the getter methods
    -return the file list verbosely

    Start parsing the packages using ipkg.py and implement
    a simple comparing of two packages.
    Todo:
        -Remove, analyse the error when comparing
        -Find a way to invoke the method by name (__call__ or such)
        -Compare post install, pre install scripts
        -Find the source for different md5sums (files, control script, header, files)

    Implement diffing the content of two directories
    and showing the difference. as mithro pointed out
    the splitting could be done in one loop and I have
    other optimisations in my head as well, but this way
    it just looks sexy and is intuitive.

    Add a work in progress ipkg-diff utilitiy to show
    differences between two directory of ipk packages files.
    Currently it does nothing.