[feature request] better keyboard control for side/top views

[Andreas Hilboll]

It would be helpful if, while in a sideview or a topview, pressing the LEFT or RIGHT keys would automatically select the previous/next valid_time, and create the plot. Similarly, in the topview, pressing UP and DOWN could select the layer above/below and automatically plot it. This would make the user less dependent on using the mouse and should be easy to implement.

[Joern Ungermann]

This sounds reasonable and is easy to implement. Especially using "update on changes" and prefetching this could simplify plot selection dramatically. I propose to add this to 1.4.0 In addition one could use alt-left alt-right to switch initialisation time. I do not think that the other ui elements would profit from keyboard shortcuts as much.

[Andreas Hilboll]

We would be very happy to see this in 1.4.0.

That being said, I unfortunately won't be able to contribute to client development due to lack of GUI experience (and time). I'd be happy to help in testing, though.

[Reimar Bauer]

Added keyboard shortcuts to wms_control

Fixes issue #167

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