Refactored optional_crypto, removed the optional part.
* additionally switched to default seed for gmpy rand method
Fixup
No more privatesemantic, privatesearch, and privatesocial.
Only tunnelcrypto remains
Fixup
Not using custom DH implementation anymore, switched to DH included in
M2Crypto/OpenSSL.
Old version which includes custom DH renamed to OldTunnelCrypto.
No more gmpy rand
Testing ecelgamal encrypt/decrypt in performance loop