Output of active/inactive elements for deactivated subdomains

Adding output of active/inactive elements for each process variable with deactivated subdomains. In the usual case w/o the subdomain deactivation there is no output.

Minor updates to related deactivated subdomains, as early exit and removal of unnecessary if-condition.

Review commit-wise.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by Dmitry Yu. Naumov

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