Merge from vendor branch TNS:

Merge from vendor branch TNS:
Initial import of abc2ps-1.3.3, a music typesetting program for abc.

Abc2ps is a typesetting program for abc. It reads a file containing abc
code and outputs the music to another file in Postscript. The music can
then displayed (i.e. using ghostview) or printed on a Postscript
printer. The program is written in C and runs on most systems which have
a C compiler.