release: 1.3.153

release: 1.3.153

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* Some small chord name fixes.

* Added alternative introduction to tutorial; to be merged.

* Reverted simple easy note head function, as some printers seem to
choke on it (so there are printers that don't use ghostscript?).

* Chord tremolo fixes: shift beams vertically on whole notes.  Center
beams on whole notes.  'beam-gap' had been renamed to 'gap', but only
for reading.

1.3.152.j