[modules/xrandr] Do not overwrite i3 config by default
[modules/xrandr] Do not overwrite i3 config by default

Require user to explicitly enable overwriting of i3 config files before
starting to automatically assemble the i3 config from a template and a
set of display-related config files.

fixes #322

tobi-wan-kenobi/bumblebee-status,tobi-wan-kenobi/bumblebee-status