~/.vimrc: Add tern.js.

It's quite cool, although I've yet to use it. Maybe some spring cleaning
is coming?
~/.tmux.conf: Up the history limit.
~/.muttrc: Add more mailboxes and alternates.
~/.muttrc: Better index (sidebar, format, quicknav).

I especially like the quicknav for changing between folders.
~/.muttrc: Support autoviewing rars.
~/.muttrc: Remove old label macros.

Either I should start using sup (or turnsole) again or not use them. So
off they go.
~/.muttrc: Remove {1,2,3} folder change keys.

Those are handled by the sidebar and quicknav.
~/.muttrc: Folder-specific settings (archiv, from).
~/.muttrc: Support search using notmuch.