fixed handling of key in the legend
fixed case when repetition starts with a rest.
refined measure start to be an ellipse of height 0
refined position of legends
Support annotations
removed superfluous pngs
improved debugger messages
Now support annotations in harpnote preview window
No longer see "don't know how to draw Nil"
Now have a page border in preview window
adapted arrowhead in preview window
Merge branch 'user_defined_layout_options'