* input/regression/repeat-percent-grace.ly: new file.

* input/regression/repeat-percent-grace.ly: new file.

* lily/percent-repeat-engraver.cc (start_translation_timestep):
remember first currentCommandColumn of a grace run. Fixes issue 70.

* lily/percent-repeat-iterator.cc (class Percent_repeat_iterator):
move class definition to CC file.

* lily/multi-measure-rest.cc (percent): use robust_relative_extent()

* lily/slash-repeat-engraver.cc (listen_percent): don't warn for
measure-long  repeats.

* flower/include/international.hh: include stdarg.h