Flagged out the code for birad to double bond, might come in handy for some other purpose, otherwise somebody would never have put it there.
New reaction family to go from trienes to cyclohexadienes. (reverse Diels Alder)
Updated tree for int H migration. Shamel check 1045 and 1052!
If QM fails just generate fake theenthalpy of formation = 1000 kcal/mol.
We are OK with this as the species are forced in the edge.
Updated family.txt to allow Intra_Diels_alder2
Allowed reverse reaction for Intra_Diels_alder, was not defined up to now (I thought it was crashing somewhere).