Added models for paperback application.
Lots of changes to models.
Summary view.
Deployed on webfaction.
Flipped field Document.deleted -> Document.valid.
Changed typed of DocRevision.return_transmittal to int.
Summary grouped by discipline and revision.
Added Backup to CSV view.
Summary view with different types of summaries.
Search box from home page.
Add HPC TODO list view.
Periodic statistics.
Better formatting of date in periodic_stats_view.
Disable delete_selected option globally.
Add documents waiting for return view.
Change in home page text.
Show only valid documents among those waiting for return.
Documents to be submitted view.
Fix date_format_conditional's handling of date.
Show all DocNumbers assigned to a document in a listing.