ENH: Add the anchor.multi_anchor_filter option

[BvB93]

Specify what is is to be done with ligands containing multiple functional groups.

[codecov]

Codecov Report

Merging #232 (c2d79df) into master (aee208e) will increase coverage by 0.03%.
The diff coverage is 74.07%.

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
+ Coverage   67.96%   67.99%   +0.03%     
==========================================
  Files          50       50              
  Lines        4055     4078      +23     
  Branches      755      763       +8     
==========================================
+ Hits         2756     2773      +17     
- Misses       1141     1146       +5     
- Partials      158      159       +1     

Impacted Files	Coverage Δ
CAT/attachment/ligand_anchoring.py	84.74% <30.00%> (-4.35%)	⬇️
CAT/data_handling/anchor_parsing.py	100.00% <100.00%> (ø)
CAT/utils.py	71.42% <100.00%> (+0.61%)	⬆️

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