Delete first or multiple points in labeled staff
Scrolling staff labeling
New staff module WIP
Merge branch 'master' of github.com:ringw/moonshine

Conflicts:
	moonshine/measure.py
	moonshine/structure/barlines.py
	moonshine/structure/staffboundary.py
	moonshine/structure/staves/__init__.py
	moonshine/structure/staves/hough.py
	moonshine/structure/systems.py