Suggestion: support for accessing multiple points and ways of selecting points

[efvik]

It could be useful to be able to download multiple locations at once. This should be faster than calling multiple instances of the module due to the overhead of accessing each file.

If this feature is implemented, a few convenient ways of selecting points could be easily added:

• input a list of longitude-latitude pairs and get the nearest point to each
• get all points within a rectangle of lon/lat defined with minimum and maximum values
• get nearest N locations to the input lon/lat
• get all points within a certain distance of the input lon/lat