Storing nucleotide -> lattice (cell) reference

[davous267]

Currently, UNF stores lattice cells -> nucleotide references.
However, it seems that it might be desired to also store the nucleotide -> lattice (cell, ...) references.

How this should be stored in UNF? Will it be easy to manage / keep track of when modifying UNF files?

Idea nr. 1:
The nucleotide now contains altPosition field, storing its (freeform) 3D position in the world.
A field called lattPosition could be added storing lattice-based position (how would it look?) .
The existing rules for determining nucleotide position would still apply (alternative position > lattice position).
However, I feel like this may introduce some redundancy to the stored data (as the lattice will reference nucleotides and the nucleotides will reference lattice at the same time).