GitLab

- Update Pipfiles and setup.py about dependency
- Update help, commands, arguments, options and flags to Click
- Remove endpoint check at the beginning
- Remove endpoint from the promts of get/post_/request()

- Change recipient for intermediaries tx to the issuer pubkey.
- Handle loop for multi and single recipients tx according to the type of the
recipient.

- remove check which prevents certifying again an identity.
- add check which allows to certify from the window period.

- update pip/pypi documentation release accordingly
- doc: fix typos
- Update Pipenv.lock at the same time

Black: code formatting

See merge request clients/python/silkaj!76

- Common code to retrieve validated and pending sources.
- Use different f() to process differently sources for amount or a tx.
- remove useless int()

- copy comment

- https://gannonce.duniter.org/#/announce/d82696ce-03f5-4e13-9316-20c94f00f76d

#42: Retrieve informations once and use them in the whole program

See merge request clients/python/silkaj!85

[fix] #128 TypeError: __init__() got an unexpected keyword argument 'timeout'

See merge request clients/python/silkaj!88