proportional notation bug

[Orm Finnendahl]

Spacing of proportional notation doesn't work as expected: When a measure
doesn't contain any entries (or only very few) it is often far shorter than it
ought to be. Changing the values of ly:make-moment in mid-score often results in
sometimes drastically different spacing for parts before the change occured. The
score at the following link probably has a reproducable bug:

http://icem-www.folkwang-hochschule.de/~finnendahl/download/violine-test.tgz

In order to set the example, typeset "gesamt.ly". Changing the values for the
first ly:make-moment on line 10 of the file "seite1.ly" from "99" to "100" (or
back) changes the spacing of the first line drastically.