2.15.5 regtests

[Phil Holmes]

Looks pretty clean.  Continuing midi warnings from 
http://code.google.com/p/lilypond/issues/detail?id=1678

An interesting change from mozart-hrn-3.log

"+/main/src/gub/target/linux-x86/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/input/regression/mozart-hrn3-allegro.ily:129:17: 
warning: already have slur
+   \longgrace d16
+                 ( \endlonggrace "

This was also noted by James in 
http://code.google.com/p/lilypond/issues/detail?id=75.  Reinhold said:

"That warning is okay (it was a bug that the warning wasn't shown so far), 
it really uses two nested slurs (one normal and another one for the grace)
However, that whole code is really strange:"

I'm tempted to report this as a bug in the regtest?

--
Phil Holmes
Bug Squad