Update doNotOutput
p_gnu(...'doNotOutput') is used in conversion equations to remove an input from the sum of inputs that go into outputs. This has been used in waste water treatment process to remove water from influencing the output (aerated effluent) - water is still needed in other constraints. Similar needs may be in other places. However, 'doNotOutput' requires a new name since it's purpose is not clear based on the name. It could also be used in the output side, but it is not currently on that side of the equation. Before adding it there, checks have to be made to ensure that nothing breaks.