* lily/pango-font.cc (text_stencil): allow 'tight' bounds.

* lily/pango-font.cc (text_stencil): allow 'tight' bounds.
(pango_item_string_stencil): use logical rect horizontally (to
preserve spaces), ink_rect vertically (for time signatures).

* lily/font-metric.cc (word_stencil): new interface function

* input/regression/utf-8-mixed-text.ly: new file.

* lily/percent-repeat-engraver.cc (listen_percent): remove
spurious warning.

* lily/phrasing-slur-engraver.cc (acknowledge_script): only ack
non-dynamic scripts. Fixes #30.

* lily/pango-font.cc (pango_item_string_stencil): use
logical_rect. This prevents spaces after words from disappearing,
issue #72.