Suggest renaming`interpolate!` to `fill!`

[alex-s-gardner]

My intuition for interpolate! is a function that can retrieve geoarray values between exact indices. For this reason I would suggest renaming interpolate! to fill!.

[evetion]

Hmm, fill! would be a better name, but it would be a breaking change. And this doesn't solve your implicit question, that you want a interpolate method that retrieves values by interpolation right? Would you have a preference, for the interpolation method?

[alex-s-gardner]

I'm not in need of an interpolate method yet but I can see this as a basic tool that would need to be included with GeoArrays. I think changing interpolate! to fill! earlier than later would cause the least disruption if you agree that it's a needed change.