Fine zoom control

[davipatti]

The smallest movement my mouse wheel can make generates a pretty big change in the zoom level. It would be nice if you could smoothly zoom in and out, rather than the zoom changing in large steps.

This is useful if you have two maps side by side and you want to get their grid spacing to match up.

When you're in an R session and have run view(map) you can alter the zoom by clicking on the 'i' icon and entering a value for the zoom. But, you currently can't do this when you've exported the map to HTML. I'm not sure if this is a bug, or expected behaviour, but it would be nice if you could edit the zoom (and rotation / transformation matrix) in HTML too.