[PATCH] More on mensural notation

[Juergen Reuter]

Hi!

The problem with Staff_symbol_referencer::staff_symbol_l turned out to
be a simple typo, hence here comes the announced patch.  Though it now
produces some new programming errors in 1.5.56 (Infinity or NaN
encountered), which did not happen in 1.5.53.  Maybe I will eventually
have a look at it.

This patch is just another tiny patch towards mensural notation.
Since you requested for a test file last time, I also included a small
preliminary test file, but that is going to be replaced by a
comprehensive example, as soon as mensural notation basically works.

Greetings,
Juergen

lily_patch_1.5.56.jr1.gz
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