Merge branch 'stable/2.14'

Conflicts:
	Documentation/es/notation/fretted-strings.itely
	Documentation/es/web/introduction.itexi
	Documentation/web/news-front.itexi
	VERSION
	input/regression/autobeam-nobeam.ly
	input/regression/beam-collision-large-object.ly
	input/regression/clef-octavation.ly
	input/regression/glissando-chord-linebreak.ly
	input/regression/glissando-chord.ly
	input/regression/glissando-consecutive.ly
	input/regression/glissando-index.ly
	ly/predefined-mandolin-fretboards.ly