Improve envelope greeting

Doing a query on my contacts with parentheses, I noticed a few examples like "Doe, Stephen (Steve) and Cheryl" where the parenthesized name was a nickname for the husband. Though we can't reasonably catch every case, I saw that one appear 10 times in the search I ran, so I think having a quick case to handle it would be good. So basically it would just remove whatever is in parentheses unless it occurs at the end of the contact name in which case interpret it as a last name for the second person.