Version 69.1.0

Changed
* Package requests solver no longer tries to maximize number of selected
  requests but rahter follows strictly rules of requests priority
* `Install` requests with same priority as `Unistall` are resolved first
* `Install` and `Unistall` requests without condition as resolved before
  requests with condition given they have same priority specified.

Removed
* Error reported when request to install and unistall same package was
  specified