Code review comment for lp:~maddevelopers/mg5amcnlo/2.6.3_optimizenlomodel

I've continued the work in model optimization in the context of restricted model

1) redo the above work of creating new lorentz structure for identified coupling.
2) Identify opposite sign coupling and keep only one of the two.
3) Doing the same as 1 but also for opposite sign coupling. This is very helpfull to avoid numerical inaccuracy in some complex model (complex spin 3/2 for example)

I'm running all the tests (I obviously add some at the same time) and then I will push this.
So please do not start this review right now.

Cheers,

Olivier