New upstream location

Issue:

I heard from the libsharp author (Martin Reinecke) that he has a new release of libsharp at a new location:

https://gitlab.mpcdf.mpg.de/mtr/libsharp

And this version has a change to the API. Just noting this here. I am working on getting PR #2 working first, and then will address this new version.

Environment (conda list):

```
$ conda list

```

Details about conda and system ( conda info ):

```
$ conda info

```