revsets: add commonancestors revset
This is a method to reproduce "::x and ::y" such that a set can be sent in. For instance, it'd be convenient to have "::heads()" work like this but that already means "::x + ::y + ..." for each element in the "heads()" set. Therefore, we add the "commonancestors" method to mean "::x and ::y ..." for each head in the given set.
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