[PYTHON-CRYPTO] Adding functionality into DSA.

[Igor Belyi]

I've added some functionality into DSA so that it can now sign, verify,
and save/retrieve public and private keys in/from files.

To be honest, it was just copy/paste from the RSA with slight
variations. But at least now you can use DSA for some simple security
purposes.

Patch is on top of m2crypto-0.13.1

Cheers,
Igor

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