Re: how to make space between time signature and following material squeezable

[Keith OHara]

This is 
  https://code.google.com/p/lilypond/issues/detail?id=1785

For four years this space was too compressible, and would not stretch.
The behavior did not match the names of the settings and code comments,
so I raised issue 1785 to make the space rigid.

Another option, semi-fixed-space in place of fixed-space, looked like
a better choice for the space after prefatory matter.
However we do not want the space to stretch, and there is no setting for
compressible-only space.

I'll mark issue 1785 as open.