for newly created edge in translated segment, first assign it a tabFaceCenter
clean up functions, move edge drawing to FlatEdge class
fix clearGeom for FlatEdge
offset naked edges (includes naked edge who's opposing edge is a fold. for buckling this is unnecessary
return lineGuid and line from _drawOffset in FlatEdge
selected flatEdge for segmentation which stays in place is redrawin fully (tabs, offsets, whatever)
remove deprecated fnctn: Net.drawEdge()
some blunders into trying to have consistent flatEdge direction with flatFace winding; gave up and used simpler check intersection: avoid bowtie buckle faces
more robust geom adding (make sure its a guid)
working buckling in direction perp to fold edges
fix geom clearing for offset on a flatEdge