Improved plugget add/edit using wizards.
Improved form template & CSS.
Added new "model_field" filter to "modelfuncs" lib.
Fixed button order.
Fixed CSS rules for system messages.
Improved "authtools" app adding row/object-level permission backend and all related stuff (decorators, templatetags, context variables, etc.).
Added signal handler to automatically grant view/change/delete perms to the author (current user) of a model instance.
Added row/object-level permission management to "pluggets" app views and templates.
Resolved fail of "test_manage_author_permissions" regression  test (related to "LoggedInUserCache" use in "manage_dashboard").
Added warning note to "LoggedInUserCache".
Added more tests for "authtools" app and fixed many small issues on low-level permission management. The biggest change is that now "ObjectPermissionBackend" doesn't take in account anymore model-level permissions.
Added more air on the top of the sidebar.
Added args "title" and "description" (default: empty) to the "_PluggetCache.register" method (and general clean up).
Better naming of dashboard cache.
Improved plugget auto-discovering and loading: there's now a function-based public API for third-party apps.

Improved plugget form wizard, with improved context syntax which allows to specify:

 * If a context variable field is required or not.
 * If a context variable field is a foreign key to an other model class.
Fixed issues with app signal & connections logic dispatch.
Fixed plugget source loading.
Improved CSS.
Added perm check to "DeletePluggetView".
Improved "base_form.html" template (more robust and clear).
Removed unuseful filter "model_field" from "modelfuncs" lib.
Added table and model list functionalities.
Added "menus" app.
Fixed test for "model_name" templatetag (changed behavior).
Added tests for "render_model_list".
Added more tests to "pluggets" app.