Rename aux.py to auxiliary.py to make pynn works on Windows machines.

[ChihweiLHBird]

Since aux is a reserved file name on Windows, aux.py is not allowed on Windows machine and can lead to an error. Simply change the name of the file from aux.py to auxiliary.py can fix it.

Microsoft Documents: https://docs.microsoft.com/de-de/windows/win32/fileio/naming-a-file
Similar change done for another python package: TUD-RST/symbtools#5
Related issues: #666, #446

[coveralls]

Coverage remained the same at 43.644% when pulling d190ce4 on ChihweiLHBird:master into d8056fa on NeuralEnsemble:master.

[ChihweiLHBird]

Python 2.7 and 3.3 tests failed but Python 3.6 test works fine. Since 2.7 and 3.3 are out of official support period, I would suggest removing Python 2.7 and 3.3 and add 3.5, 3.7, 3.8 for testing.

[apdavison]

The test failure for 2.7 is one which is known to fail occasionally as it involves a statistical test; it has nothing to do with the PR. The failure for 3.3 is in uploading coverage stats, the tests actually all pass.

(Agreed on updating the test matrix to more recent versions of Python; we plan to do this soon).

[macknight]

install tf-encrypted failed. how to rename? I can't even find the fold.

ERROR: The tar file (C:\Users\xx\AppData\Local\Temp\pip-unpack-plha6gd0\tf-encrypted-0.9.1.tar.gz) has a file (C:\Users\xx\AppData\Local\Temp\pip-install-bj8xrdtv\tf-encrypted_08c1f7c5ab8c46a19975b7aaec907caf\tf_encrypted/operations/aux) trying to install outside target directory (C:\Users\xx\AppData\Local\Temp\pip-install-bj8xrdtv\tf-encrypted_08c1f7c5ab8c46a19975b7aaec907caf)

[codenum137]

@macknight
hi, I get into the same problem when installing tf-encrypted, have you fixed it? how? thx

[apdavison]

@macknight @codenum137 I don't think your issue is relevant to PyNN