Add setting to switch between log and linear scales on axes

[prototaxites]

It seems that when I add data to a blobDir, blobtools automatically decides whether or not to display the variable on the log scale (presumably based on the scale or range of values).

It would be nice to have an option under the settings tab to be able to switch the display of an axis from one to the other while in the viewer - sometimes it is desirable to look at some region of the plot on a linear scale.

[rjchallis]

Yes, the scale is automatically selected based on the range of values (or for some data, the field name). I certainly think an option to change the axis scales would be useful so will give this some thought.

It's likely to be a while before I can implement something like that though. The scales are all defined in the meta.json file in the blobDir so finding the relevant entry in the fields array and updating the scale would be a potential (though much less elegant) option in the meantime

[prototaxites]

Thanks, I can do that in the meantime - it's not much of a hardship!