The M_PointGroup class represents a named group of points in a vector mesh.
Returns the name of the group.
Return value (string): the name of the groupReturns the number of points in the group.
Return value (int): the number of points in the groupReturns a point in the group.
Return value (M_Point): a point in the group id (int): the id number of the point (0 is the first point in the group)