Re: Fixes note column skylines by adding a stem tremolo pure height function. (issue4754054)

[pkx166h]

Make works ok, but I get some warnings in the reg test

--snip--

@@ -9,6 +9,36 @@
   a'4
      :4 c:8 a:16 c:32 a a: a2:
 Preprocessing graphical objects...
+programming error: minimise_least_squares ():  Nothing to minimise
+This means that vertical spacing is triggered
+before line breaking
+
+continuing, cross fingers
+programming error: minimise_least_squares ():  Nothing to minimise
+This means that vertical spacing is triggered
+before line breaking
+
+continuing, cross fingers
+programming error: minimise_least_squares ():  Nothing to minimise
+This means that vertical spacing is triggered
+before line breaking
+
+continuing, cross fingers
+programming error: minimise_least_squares ():  Nothing to minimise
+This means that vertical spacing is triggered
+before line breaking
+
+continuing, cross fingers
+programming error: minimise_least_squares ():  Nothing to minimise
+This means that vertical spacing is triggered
+before line breaking
+
+continuing, cross fingers
+programming error: minimise_least_squares ():  Nothing to minimise
+This means that vertical spacing is triggered
+before line breaking
+
+continuing, cross fingers
 Calculating line breaks...
 Drawing systems...
 Writing header field `texidoc' to
`/home/jlowe/lilypond-git/build/out/lybook-testdb/09/lily-c7e028e5.`texidoc'
to
`/home/jlowe/lilypond-git/build/out/lybook-testdb/09/lily-c7e028e5.texidoc'...

---

also two reg tests show changes

See attached images on

http://code.google.com/p/lilypond/issues/detail?id=1768

http://codereview.appspot.com/4754054/