Currently only works on curves, removes other curves that are duplicates within a specified tolerance (curve endpoints must be in tolerance too).
The RemoveDuplicates command does not currently have a button in the UI, it must be set up on a keyboard shortcut (under Options > Shortcut keys) or have its command name typed in (press Tab first to enter a command name) to launch it.
Removing overlaps that do not have the same length is a lot more difficult.
