- update for singlespec
- improve test runner, drop tox-disable-env-tests.patch
- split off common python-tox-doc subpackage
- update to 2.7.0
* improve environment information for users
* add "alwayscopy" config option
* slightly backwards-incompatible fix for {posargs} substitution
* add Python 3.6 and 3.7 support
* more bugfixes, see CHANGELOG for more details