Sample coordinates map enhancements

[johanvonboer]

• Take into account 'accuracy' where such a value exists. Points/circles could for example expand to encompass a larger value corresponding to the accuracy value, assuming it's a numeric value. Which is assuming a lot.
• Add ability to toggle whether to display altitude/depth data? If this is default off it would make the alt/depth scale less prone to being mistaken for a map scale indication since it would pop up when it's turned on.
• Add easier and more obvious way of selecting different sample groups to display on the map. This is already available under 'Display options', but I would like for it to be more obvious and easier to access somehow.