Use scipy create_group for SymmetryGroups

[j-c-c]

Resolves #1275

Refactors SymmetryGroup's to use scipy create_group. Also adds icosahedral volume to synthetic volumes.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.58%. Comparing base (c255119) to head (89b90a6).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/aspire/volume/volume_synthesis.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1281      +/-   ##
===========================================
- Coverage    90.60%   90.58%   -0.03%     
===========================================
  Files          132      132              
  Lines        14181    14162      -19     
===========================================
- Hits         12849    12828      -21     
- Misses        1332     1334       +2     

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[garrettwrong]

I have just one question. Code looks a lot lighter, thanks.

[j-c-c]

@janden, hold off on reviewing this one. I have to figure out what's going on with this failing "expensive" test.

[j-c-c]

Ok @janden, this is ready for review now.

I had to fix the method that globally synchronizes estimates with respect to symmetry group elements. When I work on #1283 that method will be replaced with a general method that handles arbitrary symmetry groups.

[janden]

Very nice!