Add new range constraints to a model. A range constraint states that
the value of the input expression must be between the specified
upper bounds in any solution.
|GRBConstr*||addRanges (||const GRBLinExpr*||exprs,|
exprs: Linear expressions for the new range constraints.
lower: Lower bounds for linear expressions.
upper: Upper bounds for linear expressions.
name: Names for new range constraints.
count: Number of range constraints to add.
Array of new constraint objects. Note that the result is heap-allocated, and must be returned to the heap by the user.