* lily/chord-name.cc: remove props chord, bass, inversion.

* lily/chord-name.cc: remove props chord, bass, inversion.

* Documentation/user/appendices.itely: add Scheme functions,
context-properties and layout properties to manual.

* scm/part-combiner.scm (determine-split-list): include rests in a
solo1/2 sequence.

* lily/new-part-combine-iterator.cc (substitute_both): new
function.
(class New_pc_iterator): add separate Voice=solo context, fixes
autobeams going from chords to solo.