Constructor from an ordered pair of PoolName (string like) and function objects
# S4 method for `function`,character
InFlux_by_PoolName(func, destinationName)
object of class:function
, A function. The names of the formal arguments have to be a subset of the state variable names and the time symbol
This allows subsequent automatic reordering of the state variables.
In the presence of a vector of state-variable-names the formulation can
automatically be transformed to a function of a state VECTOR argument and
time
object of class:character
, PoolName (string like) object and a function