Log Message:
Update misc/tmux to 2.2.
Use release tarballs instead of tagged archives, simplifies
patching and rids us of automake dep.

CHANGES FROM 2.1 to 2.2 10 April 2016

Incompatible Changes
====================

* The format strings which referenced time have been removed.
  Instead:

  #{t:window_activity}

can be used.

* Support for TMPDIR has been removed.  Use TMUX_TMPDIR instead.
  UTF8 detection how happens automatically if the client supports
  it, hence the:

  mouse-utf8
  utf8

  options has been removed.

* The:

  mouse_utf8_flag

  format string has been removed.

* The -I option to show-messages has been removed.  See:

  #{t:start_time}

  format option instead.

Normal Changes
==============

* Panes are unzoomed with selectp -LRUD
* New formats added:

  #{scroll_position}
  #{socket_path}
  #{=10:...} -- limit to N characters (from the start)
  #{=-10:...} -- limit to N characters (from the end)
  #{t:...} -- used to format time-based formats
  #{b:...} -- used to ascertain basename from string
  #{d:...} -- used to ascertain dirname from string
  #{s:...} -- used to perform substitutions on a string

* Job output is run via the format system, so formats work again
* If display-time is set to 0, then the indicators wait for a key
  to be pressed.
* list-keys and list-commands can be run without starting the tmux
  server.
* kill-session learns -C to clear all alerts in all windows of the
  session.
* Support for hooks (internal for now), but hooks for the
  following have been implemented:

  alert-bell
  alert-silence
  alert-activity
  client-attached
  client-detached
  client-resized
  pane-died
  pane-exited

* RGB (24bit) colour support.  The 'Tc' flag must be set in the
  external TERM entry (using terminal-overrides or a custom terminfo entry).