[ardour-dev] latest CVS commit

[Paul Davis]

   * fix nasty error in AutomationList::cut_copy_clear() that
     allowed duplicate points to be added to the list. This
     fixes wierdness with region splitting noticed after my
     last commit.

   * regions created by splitting retain envelope-visibility
     setting of the parent.

   * toggle gain envelope visibility/active status from region context
     menu
     
   * fix a bug that allowed addition of region gain points outside the
     region.

   * ardour/gtk: 0.577.1
     libardour:  0.875.1