Allow the user to supply starting conformers from an SDF

[fjclark]

Description

Allow the user to supply starting conformers from an SDF

Status

• Ready to go

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.89%. Comparing base (43cd405) to head (6835b1e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
presto/load_molecules.py	82.14%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   92.85%   92.89%   +0.03%     
==========================================
  Files          26       26              
  Lines        2843     2912      +69     
==========================================
+ Hits         2640     2705      +65     
- Misses        203      207       +4     

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