Improve ExampleFem2D clarity
Improve ExampleFem2D clarity

Change the function name to create the fem2d cylinder, for more clarity
Add comments to explain how the cylinder is build
Handle case connecting last node to 1st node in the loop using a modulo (thanks Walter)
Clean up the component names
Fix the aspect ratio of the window (4/3)

simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim