[ardour-dev] latest CVS commit

[Paul Davis]

   * fix deep order-of-operations problem that prevented
      Session->{Open,Recent,New} working with new plugin in/out code.
   * delete failed redirect, not just plugin, when adding a new plugin
      fails
   * fix for crash at session close caused by list iterator botchups
      (thanks to nick murtagh for discovering this one)
   * (in previous un-announced commit) patch from nick mainsbridge
       for crashing bug induced by tempo change
  
     ardour/gtk: 0.539.1
     libardour:  0.843.3