Many Path object forward its editing operation to the job object. It is
possible that some editing option change may lead to removing of the
editing object (e.g. changing stock type) causing crash. It is possible
to just open the task panel without setting any editing object by
returning False in ViewProvider.setEdit()
The class variable name was not corrected with previously committed changes.
The correct cutting edge variable name is located in the __init__() constructor method.
Fixes path generation for selection of two non-parallel edges.
Fixes path generation for selection of single, bottom face of slot with two non-parallel ends.
Fixes path generation for selection of two parallel, bottom bounding edges of slot.