Creates a new butt-joint sequences and adds it to this modeling group.
Parameters:
-name: Name of the butt-joint.
-id: ID of the name.
-global_ply_nr: Global ply number which orders the ply sequences.
-primary_plies: List of tuples (modeling ply, level). Define the source of the thickness between plies.
-secondary_plies: Single or list of modeling plies. Secondary plies inherit the thickness from the primary plies.
-active: Boolean for whether the butt-joint sequence is active.
