Cryptoshop

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- change argon2_timing_cost to 25
- change argon2_memory_cost to 1 << 16 (64 mebibytes memory usage)
- Remove unitests from test.py. I use pytest now.
- Add some tests to tests.py . Not necessary used by cryptoshop in this version, but for future usage.
- For future usage, Add a "calc_derivation_formated" function to _derivation_engine. The standard Argon2 output is like this:
$argon2i$v=19$m=65536,t=25,p=2$MTIzNDU2Nzg5$IDESCoEh89zGN7Nt3ecEMrEjN+oYO62p1m/ExgqTy3o

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NIST recommends a 96-bits nonce length for performance critical situations but it can be up to 2^64 - 1 bits.
Nonce length is now 328 bits. To make unique nonce, cryptoshop use a concatenation of an incremental counter,
UUIDv4, and a long (to minimize drastically collisions) random part generated by RNG.
This changes make this version incompatible with the first version 2.0.0