Was looking to implement this feature and found it was already
implemented but is a secret feature.
Updated documentation and modified implementation so it is possible
a user can discover the feature via usage such as "quit -help -invalid"
like other commands.
The website documentation now points to these contents in a clone
of the repository on opencircuitdesign.com, so all future edits of
the command-line documentation will be made directly to the git
repository. Also: Changed the precision of box values printed in
microns from 2 to 3 digits after the decimal place, so that 5 nanometer
grids do not get values clipped in the output.
Darryl L. Miles
Tim Edwards