* lily/parser.yy (assignment_id): allow LYRICS_STRING as
identifier definition too, so foo = \lyrics { ... } bar = #1
doesn't complain about "bar" being LYRICS_STRING.
* lily/paper-def.cc (find_pango_font): new routine; Store
pango_fonts in hash tab too. This is necessary for retrieving
Pango_fonts::physical_font_tab() later on.
* lily/pango-font.cc (pango_item_string_stencil): bugfix: don't
crash if psname is null.
* lily/lily-guile.cc (ly_hash2alist): new function