Feature request: Printable representation of Segment

[ajjackson]

It would be nice if Segment objects had a standard printable representation, such as 2.3 eV [0 0 0] -> [1 0 1]. This can can be implemented by providing a __str__ method. It would make it easier to keep track of them and work with them interactively. The method implied in the tutorial is to repeatedly call plot_segments until you're sure you have the index of the one you want.

[lucydot]

Thanks for the suggestion - I've implemented this feature here and a usage example is in the notebook (under 'Generate band segments').