Class _WatLigFragDistance

      object --+        
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GeomAnalyzerBase --+    
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  _CompositeAnalyzer --+
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                      _WatLigFragDistance

For all water molecules within distance (hbond_cutoff + 0.3) to the ligand, find the mininum distance between water oxygen atom and the closest ligand fragment centroid. To further exclude water bridges, call _cleanup_water_ligand_distance. Use class WatLigFragDistance instead for automated cleaning up.

Returns a list of dict. The length of this list is the number of frames. The dict key is 'LigWatResult', and the value is a list of _WatLigFragDistance.Result, where frag_idx is the index of the ligand fragment, wat_res_num is the water residue number, distance is the distance between water oxygen atom and ligand fragment centroid.