maxosx support for 10.4 to 10.7, test binaries

[Graham Percival]

There are darwin-ppc and darwin-x86 binaries here:
http://lilypond.org/~graham/

There is one report that the x86 version fails to work on 10.5.8,
which seems odd since I would have expected more complaints if
that was the case.  If you have a mac, could you check those
binaries?  Make sure you download the right version for your
architecture.

There's some comments here:
http://code.google.com/p/lilypond/issues/detail?id=1919

Cheers,
- Graham