Add ability to show multiple births (twins, triplets, etc.)

[karlic]

It would be nice to have a list of individuals born as part of a multiple birth. (Requested here: https://www.facebook.com/groups/FamilyTreeMakerUsers/permalink/2675123365967469/)

It is possible to manually compile them with Main Lists | Individuals and then sorting by Birth Date, but it would be nice if these were automagically compiled and available for viewing within FTAnalyzer.

Thank you.