Feature/arjun/allow save

Update startup script for 12.10 Ubuntu.

Added "quantal" to the list of known distribution names.

Improve fileinput message

Support for multiple rectangle hitboxes in imageresponse

Fix imageresponse in Firefox

putting vsepr static image files where vsepr js can find them. TODO: reogranize after proper input type static file storage is sorted out.

Permit collapsibles in capa detailed solution

Add an end date to courses.

- needed for cert generation (and later lots of other things)

Vik/add instrumentation

Vik/add instrumentation