Merge branch 'master' into each_net_zoom2
Merge branch 'master' into each_net_zoom2
scaling events sorted

changing things a lot, save point.
zoom by net works, needs translate
translation now functional
dragging and networks mostly working

when you make an inner network too big, it can escape!
fixed converter and line drawing
physics mostly working

scaling for relative ens/node sizes needs to be done
reasonable state first draft

needs recur links scaling fixed, text fixed, minor tweaks to collision.
zero instead of random initial placement
Merge branch 'each_net_zoom2'