Updated all to new settings file
Changed timing of stl generation

Instead of wasting time generating each time dimensions are changed, it
now waits until you click the preview/print button
Changed all settings to same file

import settings was not compatible with import GUI.settings
Fixed display bug
STABLE

This test works well, but I am about to diverge into a possibly more
successful means to show the viewer
Merge branch 'WIN_nest_VPython'
After merge cleanup