Ran the regtests for issue 39

[Mike Solomon]

The only change I can see is in collision heads, which adds breathing room 
between the stem and the flag (I've attached old and new).

I am not an expert on how much room should be in there - I leave it to someone 
else to fiddle with the magic numbers in note-collision.cc to get it right.  I 
opted for a little space, but it could be "just touching" as well.

Cheers,
MS