fixing obnoxious sync bug where a non-delete with an existing _sync field ALWAYS registers as a create...was seriously tripping up some of the board sharing stuff, but could have potentially wreaked havoc on a lot of other data updates as well since the new "check msg.action" rul in process_local_sync. annoying. fixed.
rendering sharing interface separately from persona list in board sharer. no more re-rendering of invite box mid-type!