Use PyPSA implemnetation of Haversine

[trevorb1]

Feature Request

We have a haversine function here. PyPSA has this function in their geo module (see here). We should switch to using PyPSAs as it has checks and tests.

Suggested Solution

No response

Additional Info

No response

[ktehranchi]

There was a reason I didn't use that function, and I will have to go back to test it to remind myself why. I think it was very slow for large vectors.