Scrypt: migrate from pylibscrypt to hashlib.scrypt from the standard Python 3.6 lib

DuniterPy currently uses pylibscrypt:

Other Python libraries implementing Scrypt:

  • pyscrypt: pure Python, but not in Debian
  • py-srcypt. In Debian, Python wrapper around C, was used in Silkaj 0.6.0 before DuniterPy migration

Edited by Moul