* Scan folders and write into child cursors
* Clicking a folder takes you to MessageList
* Remove most links to FolderMessageList (nearly dead!)
* Repair 1-account startup behavior (takes you directly to inbox)
* Cleanup a few basic things like context menus & refresh
TODO: Magic mailbox section at the top
TODO: As always, better linkage to sync engine(s)
TODO: Menus, context menus, etc.
TODO: Proper handling of expandable list - accounts should stay open?
