do the initial_settings with a hook.
  this was done previously, but the commit is missing apparently.
new words
"user add key"s should go out of the proc
comments
set textwidth to 80
savexyz now expects the atom selection and filename as arguments
let 4 char element name
do not auto-cd into /tmp
a simple select mode with S key
geom_center and mass_center to calculate the center of a selection.