Conflicts: __init__.py formats/folia.py setup.py
Bug fix, some clarifications, and several disputable changes.
Fixed two bugs, changed long lines, some automatic formatting.
setup.py: fix installation under pip , use __file__ instead of sys.argv
…ich indicates all non-authoritative elements will be skipped, alongside other specified elements. addable() now uses this to never recurse into AbstractStructureElement (fixes a bug with nested corrections)