Overview of changes between 1.17.2 and 1.17.3
==============================================
- Extensive pangocairo internal code refactoring and cleanup

- New public API:

	pango_font_face_is_synthesized()

	pango_cairo_font_get_scaled_font()
	pango_cairo_font_map_new_for_font_type()
	pango_cairo_font_map_get_font_type()

- New engine macros:
	
	PANGO_OT_TAG_MAKE()
	PANGO_OT_TAG_MAKE_FROM_STRING()

- New PangoFontFace method is_synthesized.

- Misc bug fixes
- Bugs fixed in this release:
	Bug 337593 – move glyph extents code (and cache) from
		pangocairo-*font.c into pangocairo-font.c
	Bug 347235 – Add pango_cairo_font_map_get_font_type
	Bug 347236 – provide pango_cairo_font_get_scaled_font
	Bug 353291 – Provide pango_cairo_font_map_new_for_font_type
	Bug 438801 – underline should add "error" type.
	Bug 440588 – Add pango_font_face_is_synthesized()
	Bug 445832 – pango_cairo_update_layout() always invalidates layout
	Bug 446018 – Bus error in the pango_ot_tag_from_language()
	Bug 446355 – the parsing with pango_parse_markup is not coherent
	Bug 447189 – fonts.c: pango_font_face_is_synthesized returns NULL
	Bug 447568 – improve docs on what absolute size means
	Bug 448342 – pango_layout_index_to_line_x() counts lines from 1