Commits on Apr 9, 2021

1. Allow more lax env selection from computed factors …

   The previous env selection was rather strict when there were more than 2
   factors supplied and this change allows users to relax it with the
   section value "envs_are_optional" which will become the default in a
   future release.
   
   Given the following factors:
   
     [{"py38", "lint"}, {"reqV1", "reqV2"}, {"opReqV1", "opReqV2"}]
   
   The existing env selection would only match:
   
   - py38-reqV1-opReqV1
   - py38-reqV2-opReqV1
   - py38-reqV1-opReqV2
   - py38-reqV2-opReqV2
     ...
   - lint-reqV1-opReqV1
     ...
   
   It would fail to match the single factor "lint". Although, this may be
   correct for required factors, but for something like "lint" it may not
   need the additional factors that are required with the previous env
   selection.
   
   This change allows selecting the following envs:
   
   - py38
   - py38-reqV1
   - py38-reqV2
   - py38-opReqV1
   - py38-opReqV2
   - py38-reqV1-opReqV1
   - py38-reqV2-opReqV1
   - py38-reqV2-opReqV2
   - lint
   - ...
   
   In addition, this change makes the order of the factors no longer important:
   
   - py38-opReqV1-reqV1
   - reqV1-opReqV1-py38
   
   All of these permutations are bound by the envlist that the user defines
   in their tox configuration so it is up to the user to keep their
   configuration organized and not go crazy with their factor ordering.

   

   terencehonles committed Apr 9, 2021
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