Draft gravity point spherical kernel

[LL-Geo]

Draft gravity point spherical kernel

Working progress..

Relevant issues/PRs:

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[LL-Geo]

Plan to go back to this... Just noticed that #58 will Restore kernels for point source. Will we do the same for spherical kernel? With one file include forward calculation and the other only do the kernel?

[leouieda]

Hey @LL-Geo don't know if this was covered in a call but @santisoler brought this up in our lab meeting and I think it's not worth the effort of adding them now. If they're ever needed later, it will be easier to add them than to take them out if we find that they're not needed.

[leouieda]

Also, really looking forward to these! I'll need to start implementing spherical gravity and magnetic equivalent sources in the near future 😉