corrects the mismatched edge lengths which was caused by the way I initially find seed verts

and then continue away from the seeds.  Fixed by reversing the order of the first two verts
found.  fixes #10
improves the segment limit, making it limited by the cross section with the fewest raw verts.

fixes #9 because max vert count no longer causes crash.  However it is preferable to not have
final mesh depend on topology of the original mesh.
screen shots
Addon Preferences added to control what gets displayed and what size verts, edges etc are.

Initial debug level added.  Still need to sort through code and give printout based on debug
level. #13
typos, comments, printouts.