New filter rules for genetic genealogy

@Mattkmmr
Thank you! I just used the following add-on rule to suggest a solution in another thread.

I had to install it to test the solution and discovered a couple tweaks that would be nice:

  1. Could you move it from General filters to Descendant filters? (Dave already suggested that.)
  2. Could you add an Inclusive: Include selected Gramps ID checkbox like the “Descendants of <person>” from Descendant filters?