* create related test

tests:
    * one amount in base 0 -> 1 output
    * one amount in base 2 -> 3 outputs of base 2, 1, 0
    * one listinput to be extended with the amount.

    * one test for good values
    * one test for errors catching the SystemExit.

    * patch ClientInstance inside the testing function

    * create patched_handle_intermediaries_transactions
    * patched_transaction_confirmation
    * patched_generate_and_send_transaction

* two test cases:
    * with two outputs and a backchange, without intermediary transaction
    * with one output and no backchange, with an intermediary transaction

  * make one test only errors
  * move it from test_unit_tx.py to test_tx.py

  * make test_membership.py use it
  * make test_generate_transaction_document use it

    * importing silkaj.tx instead of each single function
    * remove useless UDValue import
    * change test_transaction_confirmation to use G1_SYMBOL as a constant

* modify values to facilitate test writing
* rename `amount` variable to `balance`

* create test_constants file to prevent circular dependencies
    * modify relevant files : import mock_ud_value from patched.test_constants instead of patched.money

* patched_get_sources() now has a `counter` attribute, and can return different values if called twice
    * can mock the result of an intermediary transaction.

* mod test_get_list_input_for_transaction()
  * to reset the patched_get_sources counter.
  * to make values match new patch behavior
  * to comment what is tested

* Move patched functions from test_membership.py to relevant files
    * blockchain_tools.py
        * create mocked_block variable
        * make both patched_block and patched_head_block return mocked_block
    * auth.py
    * wot.py
* modify a pubkey list in patched/wot.py
* change calls in the tests
* change pubkeys in patched/money.py to match new pubkey_list

* add patched auth functions

For unit test purposes, we need to do:

`from silkaj import module`

instead of

`from silkaj.module import function1, function2`

Otherwise, we can't patch functions.

* create patched directory
* create files matching the silkaj modules
    * money.py
    * tools.py
    * wot.py
    * blockchain_tools.py
* delete patched.py
* change calls in the tests

  * reason: "moulid" new uid creates conflict with "moul" and makes tests fail

Which comes with initial GVA support

    -> return error in that case.
    -> displays an error for each wrong pubkey
* write tests for errors on `balance` command

Using runner tag 'poetry-56' replacing test-3.5 job load

aiohttp updated to v3.7.1
multidict updated to v5.0 which drops Py 3.5 support

Requires Python 3.6.8
Remove test job

Not added as a direct dependency, since it is a DuniterPy dependency
And Silkaj won't get away from DuniterPy, nor DuniterPy will stop using
base58.

Not compatible with Poetry v1.0
Update dependencies

- Set poetry-core v1.0.0 as requirement and new build system
https://python-poetry.org/blog/announcing-poetry-1-1-0.html