Modularize and integrate with contrib.admin

[allanjamesvestal]

Integrating this workflow with a model should be as easy as three steps:

• Declare a ModelAdmin-like configuration for your model and register it with the special admin.
• Create a workflow around that model (based upon django.contrib.auth groups) through an admin interface.
• Create great content.

Optionally, users should be able to customize the following:

• How content is displayed in side-by-side diffs (through a template or an ordered list of fields).
• How content is displayed in the preview (through a template).
• How content can be created (through pitches, editor or staffer creation or all of these).
• The number of edits to keep in memory (either x days/weeks ago or y latest edits).
• The amount of time for which a user is allowed to be editing content before they are booted and have to re-open the item.
• Which tabs to display in the change form.

Hook this in with django.contrib.admin, wherever possible. Make things visually consistent, though this may involve separate tabs for WorkflowAdmin- and ModelAdmin-registered models.

[allanjamesvestal]

Eventually, this will also get ported to Grappelli, so there will be two different interface designs afoot.

Also, try to mix in support for modular admin add-ons (like admindocs).

[allanjamesvestal]

This will likely go in an entirely separate 'Tab' within the Nando admin-like site. That site will list all of the nando-ible models; you'll be able to define multiple workflows for each type of content (articles on and off production nights, etc.) and set all these last series of options for each workflow.