Log Message:
Updated abcm2ps to 8.13.5.

---- Version 8.13.5 - 2017-01-31 ----

Fix clash of dot and glissendi
	(reported by Manavasu)
Fix lack of double bar at end of line with "|ccc||$|:c|"
	(reported by Timm Reasbeck)
Fix lack of stem when some invisible note heads in chord
Better glissendi
Fix random bad offset of helper lines
	(reported by David Lacroix)