[PATCH] support for flagged crotchets in mensural notation

[Lukas Pietsch]

Hello list,

here's my next portion of patches for the extended mensural notation 
support I mentioned the other day. This bit is to get full support for 
the various options relating to black and hollow (unflagged and flagged) 
small note values (crotchets and below), as discussed in section 6.7 of 
the document I linked to 
https://www.dropbox.com/s/nrcz11hkslsbc52/custommensural-2015-02-23.zip?dl=0 
I added a regression test snippet that should illustrate what it's meant 
to do.

This patch contains all the changes to the C++ codebase I've been 
planning to submit; everything else should be doable in Scheme.

Regards,
Lukas

0003-Support-for-flagged-semiminims-in-mensural-notat.patch.txt
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