* input/regression/breathing-sign.ly: tiny fixes

	* input/regression/breathing-sign.ly: tiny fixes

	* lily/mensural-ligature.cc: renamed stem->cauda/join to avoid
	semantical collision with vaticana ligatures

	* lily/vaticana-ligature-engraver.cc, lily/vaticana-ligature.cc,
	scm/define-grob-properties.scm: bugfix: semantics of delta_pitch
	now consistent with mensural ligatures

	* lily/vaticana-ligature-engraver.cc, lily/vaticana-ligature.cc,
	mf/parmesan-heads.mf: bugfix: length of cauda of flexa depends on
	context pitches and staff position; dto. for virga stem; removed
	obsolete virga and clivis characters from parmesan font (WARNING:
	font changed)

	* mf/parmesan-heads.mf, mf/parmesan-clefs.mf,
	mf/parmesan-timesig.mf: fixed several set_char_box ()'s

	* lily/vaticana-ligature-engraver.cc, lily/vaticana-ligature.cc,
	scm/define-grob-properties.scm: consistency fix: renamed
	join_left->add_cauda

	* mf/parmesan-heads.mf: bugfix: cephalicus head: corrected
	appendix length; bugfix: yoffs_bt for reverse direction punctum
	characters

	* lily/vaticana-ligature-engraver.cc, lily/vaticana-ligature.cc:
	small cleanups; added more docu

	* lily/mensural-ligature-engraver.cc, lily/vaticana-ligature-engraver.cc,
	lily/coherent-ligature-engraver.cc: cleanup: moved delta-pitch
	computation to CoherentLigatureEngraver

	* ly/gregorian-init.ly, lily/gregorian-ligature.cc,
	scm/define-grob-properties.scm: bugfix: added missing linea and
	cavum properties; bugfix: removed dead semivocalis property

	* mf/parmesan-heads.mf: bugfix: linea punctum: vertical lines
	length; redesigned quilisma, stropha and auctum

	* ly/engraver-init.ly, scm/define-grobs.scm: use 0.6 as default
	line thickness

	* lily/vaticana-ligature-engraver.cc, mf/parmesan-heads.mf,
	Documentation/user/refman.itely: bugfix: introduced shifted
	epiphonus head to avoid collision with adjacent plica