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PyCryptodome comes in two flavors: “an almost drop-in replacement for the old
PyCrypto library” and “a library independent of the old PyCrypto”. The former
uses the Crypto namespace, and is shipped as `pycryptodome` while the latter
uses Cryptodome instead and lies in the `pycryptodomex` package.

Given the reason to switch to PyCryptodome is that PyCrypto in unmaintained,
its probably better to avoid any mistake and mandate the specific usage of
the Cryptodome namespace by requiring `pycryptodomex` instead of
`pycryptodome`.

A more present reason is that Debian buster will only provide a package
with the separate namespace flavor. The current Recommends is not working with
the current code. Although it's important to note that the package name will
probably have to be changed to `python3-pycryptodomex` once
https://bugs.debian.org/886291 is solved.

pycrypto accept both bytes or string but pycryptodome, which will be introduced
in next changeset, doesn't accept this.

For backward compatibility, encode unicode strings in _cypherer()

This mostly consists in removing the dependency on "six" and updating
the code to use only Python3 idioms.

Notice that we previously used TemporaryDirectory from
cubicweb.devtools.testlib for compatibility with Python2. We now
directly import it from tempfile.

--HG--
branch : 3.26

* Remove usage of unicode() and decode the base64-encoded string in
  encrypt();
* Encode the string received in decrypt() as (I supposed) it should come
  from the result of encrypt().

Add tests for this module along the way.

--HG--
branch : 3.26

* update some copyright
* drop most __docformat__ declaration
* fix some flake8 warnings / errors

Basically:

mkdir cubicweb
hg mv *.py -X setup.py cubicweb
hg mv dataimport devtools entities etwist ext hooks i18n misc schemas server skeleton sobjects test web wsgi cubicweb

Other changes:

* adjust path to cubicweb-ctl in devtools tests
* update setup.py to avoid importing __pkginfo__ (exec it instead),
  replace os.path.walk by os.walk and prepend `modname` here and there
* update tox.ini to account for new test locations
* update doc/conf.py so that it still finds __pkginfo__.py and CWDIR in
  doc/Makefile

[pylint] fix pylint detected errors and tweak it so that pylint -E will be much less verbose next time (+ update some copyrights on the way)

--HG--
branch : stable

--HG--
branch : oldstable

--HG--
branch : stable