Add Member ID Delete capability

[#1]

Consider addind the ability to delete member ID's from the community.

While I understand the consequence of removing all associated posts, with the corresponding impact to the community post data structures, especially in a threaded, non-linear view, I think there still exist some valid scenarios where this function would be useful.

1)  Some members join with multiple IDs - some of which may have been "mistakes" and are never used.   Deleting these upon request as "clean up" can free the ID's up for potential use by other members and will also help clean up reporting that could be inflated by non-used id's.

2) Some members request their information be removed, and we cannot comply other than by banning the ID.

Perhaps ID's with no associated posts could be deleted from the system via an admin function.  

ID's that have posts could be deleted, and the posts would remain unless individually deleted, but the member ID would change to "Deleted" or some other value that could be defined on an admin panel.

[#2]

Deleting member ids when a user has no associated posts makes sense. Although, I'm concerned that in a scenario where members with multiple ids have messages, not deleting the post itself and having a placeholder for 'member deleted' or 'member not present anymore' might create negativity in the community. I'd like to hear more thoughts.