Argh, the previous update was missing comments. Here they are:

Argh, the previous update was missing comments.  Here they are:
a bunch of moving and deleting.  Most are obvious, but there were
the following renamings:
test/instrument-name-mmrest.ly: moved to
  regression/multi-measure-rest-instr-name.ly
input/test/knee-sym.ly: moved to
  regression/beam-knee-symmetry.ly