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 Jun 14, 2019 by Moul

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