Helper for the
GroupedConstraint that holds a set of currently
active groups and provides a factory method for wrapping Constraint
instances in
GroupedConstraint .
author: Ilja Livenson (ilja@webmedia.ee)
Wrap the Constraint in the GroupedConstraint instance
assigned to the specified group.
Parameters: constraint - Constraint to wrap. Parameters: group - Name of the group to assign the constraint to.