Overload the getReactionGraph method to take into account reaction-wise cofactors
Work in progress:
Optimisation/Architecture
Unit tests
The side compound identification strategy is up to discussion because to be able to also consider compounds implicated in spurious edges I had to turn the problem upside down:
1: For each reaction, identify the compounds implicated in Main edges as Main compounds
2: Consider all other compounds of this reaction as Side compounds (All compounds - Main compounds)
