[ardour-dev] latest CVS commit

[Paul Davis]

  * complete redesign of slave-following design
  * stop disk-(over|under)run handler from executing in the
      wrong thread
  * fix appalling C/C++ bug preventing proper use of
      MIDI port tags
  * make solo/mute button mouse bindings more consistent
      with rest of interface (Ctrl-middle click is now
      used for MIDI learn here as well)
  * add solo button context menu

  *  libardour: 0.839.0
    ardour/gtk: 0.536.4

0.19beta22 release will happen once we get enough feedback on this
commit.