Drag rpki.POW classes kicking and screaming into the 21st century.

Replaced old factory functions with proper (well, I hope they're
proper) class __new__() and __init__() methods as appropriate, whack
PyTypeObject structures to make it possible to subclass these classes,
etcetera.   Doc strings for classes and methods are still horribly out
of date, but at least it all shows up properly now.

Caveat: This is a major change and has not yet been heavily tested.
It seems to work, but splitting the old factory functions into
__new__() and __init__() methods exposed some corner cases which I may
or may not have handled correctly.

svn path=/branches/tk274/; revision=4705

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