Ingvar issues

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                                            Ingvar

[Feature request] Add possibility to undo operation

As a user, I would like to undo my previous operation via ctrl+z or UI.

enhancement

[Feature request] Add backspace support

Hello, During typing text backspace does nothing instead of removing previous letter. It should delete previous character Thanks in advance!

enhancement

[Feature request] Selection

Please add ability to select an area on canvas and copy/move/delete it

enhancement

Please add support for EDGE_WEIGHT_TYPE : GEOM

Hello! Thanks for your library, I'm using `tsplib95-0.7.1`. Could you please add support for `EDGE_WEIGHT_TYPE : GEOM` in tsp files, like in [world.tsp](http://www.math.uwaterloo.ca/tsp/world/world.tsp.gz). Right now `tsplib95` throws an error when...