*CoilSpring()
Creates a coil spring.
Syntax
*CoilSpring(spring_name,"spring_label",body_1, body_2, point_1, point_2)
    Arguments
- spring_name
 - The variable name of the coil spring.
 - spring_label
 - The descriptive label of the coil spring.
 - body_1
 - The first body attached to the coil spring.
 - body_2
 - The second body attached to the coil spring.
 - point_1
 - The point at which the coil spring connects to body_1 .
 - point_2
 - The point at which the coil spring connects to body_2 .
 
Example
*Body(b_lca, "LCA", p_lca_cm)
*Body(b_frame, "Frame", p_frame_cm)
*Point(p_spr_upr, "Spring @ frame")
*Point(p_spr_lwr, "Spring @ lca")
*CoilSpring(spring, "Coil Spring", b_lca, 
 b_frame, 
 p_spr_upr, 
 p_spr_lwr)
    Context
Properties
| Property | Returns Data Type | Description | 
|---|---|---|
| b1 | Body | The first body to which the coil spring is attached. | 
| b2 | Body | The second body to which the coil spring is attached. | 
| c | Marker | The damping coefficient of the coil spring. | 
| f | Marker | The load on the coil spring at a particular length. | 
| i | Marker | The marker on b1. | 
| j | Marker | The marker on b2. | 
| k | real | The stiffness coefficient of the coil spring. | 
| l | real | The length of the coil spring when it has a particular load. | 
| label | string | The descriptive label of the coil spring. | 
| p1 | Point | The point at which the coil spring is attached to b1. | 
| p2 | Point | The point at which the coil spring is attached to b2. | 
| state | boolean | Control state (TRUE or FALSE). | 
| varname | string | The variable name of the coil spring. | 
| id | long integer | The solver ID of the coil spring. |