[PYTHON-CRYPTO] First draft of secret-key encryption PEP

[Rich Salz]

For symmetric keys is it really important to distinguish between encrypt
and decrypt?  Or rather to insist on it?

Particularly as these are typically bulk encryption, I think a
file-oriented interface is more useful (and important -- i don't want to
keep two copies of my divx encoded video stream in core :).  Something
like
        arc4 = ARC4(.....
        arc.write('......')
        plain = arc4.read()
etc.  read and write calls can be intermixed.

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