Detach commands: cleanup needed #43
Description
The implementation of the detach() command (pressing N to 'delete' a node) is very messy at the moment. I followed the interface design I had developed with the previous add() and select() command families, thinking that I might need more types of subclassed commands that use it. This was not the case as I only have the one command so far (I can maybe think of another - perhaps a command to mimic a removeAndSaveOrphans() instead of just the removeAndBurnTheOrphange() command I have now), so the interface is kind of unnecessary abstraction.
Additionally, I made too many helper functions to accommodate this new feature, so the implementation is spread out far too much for my liking.
Further, I need to reexamine the recentNodes list mechanic to see if I can rename and better document why these two lists are necessary and how they should be used.