[PATCH] ly-engraver-make-spanner (to compliment ly-engraver-make-grob)

[Mike Solomon]

Name says it all.

http://codereview.appspot.com/1869047

Disregard the changes to lily-guile.hh - all of my patches uploaded with
git-cl spit that out because of Mac OS X 10.4 powerpc modifications I had to
make to get lilypond compile-able.

To apply the patch set directly (w/o the lily-guile.hh modifications), you
can use the attached.

~Mike

0002-Add-engraver-make-spanner.patch
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