worked on edgecon, created smooth script

cont to work on using equi inside edgecon.
samples files up to big scale, then use smooth function to get lines
which should show more curvature. possibly useful for defining a line
direction. should also be useful for smoothing out stuff. not using
'skel' anymore, using 'thin'.

trying to remove all image morphology changes outside of edgecon and
structure them better (hence smooth.m)