Grace notes after collide with ledger lines of following note.

Ubuntu 14.04, GIT commit: 5bee9c7

See the vtest grace-3. Here is a recent run:

Look at the grace notes after beat 1 of the second measure measure, top staff.

I assume the code I added to handle ledger line collisions needs to be updated to deal with "new" grace-note-after layout. I will look into it.