* lily/output-def.cc (assign_context_def): use set_variable().

* lily/output-def.cc (assign_context_def): use set_variable().

* lily/text-item.cc (interpret_string): accept string input
encoding too.

* scm/encoding.scm (read-encoding-file): print warning when file
can't be found.

* tex/GNUmakefile ($(outdir)/latin1.enc): create latin1 from GS.

* lily/rod.cc (columnize): robustness fix. Don't crash for
nil span points. Fixes: appoggiatura-segfault.ly
(add_to_cols): extra robustness fix.