Update the graphics to a dynamic view of the geometry settings

[pmackenz]

Change the currently static image to a graphic that reads layer thickness and pile configuration and generates an appropriate graphic.

[pmackenz]

Watch out for:

• layer Master #3 needs to be adjusted to the length of the pile: soil must go at least to the bottom of the pile

• How to handle only one or two layers? Could allow layer thickness to go to zero and adjust mesher (?)

• would be nice to couple the layer interface with the table such that thickness can be changed with mouse drag and drop of the layer interface

• grabbing the force with the mouse to change its magnitude

• clicking the pile head to toggle clamped and free pile head

[pmackenz]

Issues 1 to 3 done.