* lily/slur.cc: Add quant-score to interface. Fixes web build.

* lily/slur.cc: Add quant-score to interface.  Fixes web build.

* python/SConscript:
* python/vim:
* input/mutopia/*SConscript: New file.

* scm/define-grobs.scm (all-grob-descriptions): Use ,Slur::height,
fixes web build.

* make/stepmake.make (scons): re-route to SCONS if user has been
running scons in this tree.

* SConstruct (config_vars): Add CPPDEFINES.
(env): Set checksums type to "content".
(save_config_cache): Do not exit after configuring when using
checksums (the default) instead of timestamps.