Several more history displays
Fixed some history display bugs
Fixed display of completed/deleted history items
Implemented history display repeat logic
Join with the users table to display who made each history entry
Display tag_added/removed history (will work once server sends the hash including name)
Use the same kind of union query for EditNoteActivity that we do for TaskCommentsFragment
Add a tag data column for keeping track of history fetch times
Fetch task history in EditNoteActivity
Sync history and comments in both comment fragments
Synchronize comment/history fetch callbacks
Added default values to History, fixed a bug
Send a number for history modified_after param
Reimplemented friend connection tracking under new sync
Do a BriefMe for users as a part of general sync
Run CommentsFragment refresh callbacks on the ui thread