\mark relative to top of staff markings

[Graham Percival]

I didn't see anything about this in the Changelog, so I assume it's a 
bug...

When using a \mark, the horizontal placement is as per usual, but the
vertical placement is above the highest mark on that staff line.  In the
example below, the "A" (\default) is above the ^5.

%% version 2.7.4 (cvs)
{
c'1^1^2^3^4^5 c'\mark \default c'
}