Feature request: automatic scale labelling

[Paul Bienkowski]

One could automatically generate the scale array when from, to, step and width are known, based on a few rules, such as:

• there should be about 1 label per ~50-100 px
• the difference between 2 labels should be a multiple of the step, preferably in a power of 10 (e.g. step 1, label difference 1, 10 or 100)