add parameters to the tolerance for space group finding

[bkmi]

added parameters to the SPGLibSymmetry and MoyoSymmetry classes along with the get_structure_graph function. This enables a user to choose the tolerances for symmetry finding and for finding the primitive cell. This makes the hash significantly more useful.

The defaults were chosen to be the same as SpacegroupAnalyzer

Notably, AFLOWSymmetry does not have the same parameters. Right now, it ignores user settings with a warning.

[msiron-entalpic]

This looks good to me, adding @Ramlaoui for further review. Related to discussion on #21 . @bkmi would you mind adding a description in the PR for future people looking at this? And then pending comment above.

[Ramlaoui]

LGTM! Thanks for spotting that, we'll update the fingerprint in LeMat-Bulk to take into account those parameters as well in future versions

[bkmi]

fixed it.

a couple things:

• I used the defaults for SpacegroupAnalyzer from spglib
• it doesn't work with AFLOWSymmetry because they use a different system that I did not take the time to understand. I added a warning that your parameters will be ignored.