Improve MolecularContainer.top_up_conformations

[speleo3]

Top up from all conformations, not just first.

Fixes #147

[codecov]

Codecov Report

Patch coverage: 90.00% and project coverage change: +0.08% 🎉

Comparison is base (fd7b155) 73.08% compared to head (0d6dbfa) 73.17%.

❗ Current head 0d6dbfa differs from pull request most recent head 7d78aca. Consider uploading reports for the commit 7d78aca to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
+ Coverage   73.08%   73.17%   +0.08%     
==========================================
  Files          25       25              
  Lines        3972     3977       +5     
==========================================
+ Hits         2903     2910       +7     
+ Misses       1069     1067       -2     

Files Changed	Coverage Δ
propka/conformation_container.py	84.97% <85.71%> (-0.05%)	⬇️
propka/molecular_container.py	92.52% <100.00%> (-0.07%)	⬇️

... and 2 files with indirect coverage changes

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[sobolevnrm]

Looks great!