* Add 'activate' parameter for alternatives
Allow alternatives to be installed without being set as the current
selection.
* add changelog fragment
* Apply suggestions from code review
Co-authored-by: Felix Fontein <felix@fontein.de>
* rename 'activate' -> 'selected'
* rework 'selected' parameter -> 'state'
* handle unsetting of currently selected alternative
* add integration tests for 'state' parameter
* fix linting issues
* fix for Python 2.7 compatibility
* Remove alternatives file.
Co-authored-by: Felix Fontein <felix@fontein.de>
