[ardour-dev] latest CVS commit

[Paul Davis]

   * fix a truly appalling coding error in all uses of LocaleGuard
   
         - people who run ardour with LC_NUMERIC set to something
	   other than en_US.UTF-8 will probably have continued to 
	   suffer from locale-based problems because of this
	   problem.

   * when a region overlaps another region but is wholly within	
         the other, create hidden, immutable 64-frame xfades
	 at both boundaries. (works, but some more work 
	 needed on corner cases and thoroughly testing normal
	 overlap xfades)

   * libardour:  0.853.0
     ardour/gtk: 0.552.1