Basic python3 testing packages

```
Includes:
* user/py3-tox
  * user/py3-setuptools
  * user/py3-pluggy
  * user/py3-virtualenv
  * user/py3-pytest
    ** user/py3-py

Most of these packages use tox itself for tests, so !check until we have
a copy of tox on the mirrors with which to bootstrap.
```

See merge request !16

user/acpilight: new package



See merge request !24

system/syslinux: fix typo in update-extlinux

See [BTS#54](https://bts.adelielinux.org/show_bug.cgi?id=54)

See merge request !26

Alpine will never merge Pulse support in, so why bother