Bug: headers missing when including file

[Heikki Johannes Junes]

Suppose you have a lot of pieces and you want to gather them in to a
single book. They are in separate files, like the following "test.ly":

\score {
    \notes { c }
    \header {
        title = "a piece"
    }
}

Then you get an idea, that just by making a file "gather.ly":

 \include "test.ly"
 \include "test.ly"
 % repeat even more times for testing purposes

you simply include all the scores you have. This way, you would get a nice
book with an increasing page number. But, alas. Only in the first score
there is the "\header"-field in use. There are no headers in further
scores which were included.

      Heikki Junes