Lig loader minor fix

[OleinikovasV]

• Minor bugfix for issue with RascalMCES for ligands with many bonds: https://github.com/plinder-org/plinder/issues/76

• New feature: skip PlinderSystem ligand 3d confgen'

[github-actions[bot]]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/plinder/core/index
system.py
src/plinder/core/structure
atoms.py					115, 134-138, 140, 159-162
structure.py
Project Total

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