update for print/lilypond

[Graeme Lee]

Hello

I'd like to submit a (mostly) updated the port for print/lilypond to 
from 2.14.2 to 2.18.2.

This is my first go at ports.  What is the recommended way to submit the 
updated port?  Would a new tarball be ok?  Or are patches to individual 
files preferred?  The port is based on the 2.14.2 Makefile.  I have not 
updated the lilypond-test-baseline yet

tested on amd64

Graeme