* lily/parser.yy (assignment_id): allow LYRICS_STRING as

* 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

* Documentation/user/changing-defaults.itely (Text encoding):
rewrite.

* lily/pango-font.cc (physical_font_tab): new member. Store PSname
-> font_filename mapping.

* lily/pango-font-scheme.cc (LY_DEFINE): new file. New function
ly_pango_font_physical_fonts

* scm/framework-ps.scm (supplies-or-needs): extract names from
physical Pango_fonts.

* utf8.ly: new file.