IncreaseByAmt is a binary q-operator for expressing a positive additivecomponent of a quantity-term.
Eg: (IncreaseByAmt (Battery-11 amtOfCharge) (Cell-12 amtOfCharge)) (IncreaseByAmt (Battery-11 amtOfCharge) (Cell-13 amtOfCharge))
together
states that the amt of charge in Battery-11 is the sum of the amt of
charge in Cell-12 and Cell-13, and possibly other components too.
IncreaseByAmt expressions are constraints, and do not evaluate to values.