Fixed two bugs in newforms-admin branch

[yi.codeplayer at gmail dot com]

1. the code bellow would cause error:

   from django.contrib import admin
   admin.site.register([Model1, Model2], SomeAdminClass)
   

in contrib/admin/sites.py AdminSite::register , when calling issubclass(model_or_iterable, Model) , it would complain that model_or_iterable is not class (because it's instance of list).

2. In the index page of new admin , each model is displayed in a seperated app section, there is only one model in each app section (i don't know exactly how to describe it , hope you can understand). this patch make it behavie normal.

[yi.codeplayer at gmail dot com]

The Patch.

[yi.codeplayer at gmail dot com]

Add two things: 1. Make model registry OrderDict 2. use model.__name__ instead of model.__class__.__name__ when raise exception AlreadyRegistered because model is a class.

[Adrian Holovaty]

yi.codeplayer: Thanks for the report and patch, but please split these sorts of things across separate tickets in the future. (No need to change this one, as it's already been submitted, but I'm making a suggestion for next time.)

[Adrian Holovaty]

This patch is slightly out of date -- [5441] fixed the index-page ordering thing in a slightly different way.

[Jakub Vysoky]

I made only the first change in #4571.

[Russell Keith-Magee]

As noted by Adrian, Issue 2 has been resolved in [5441]; Issue 1 is is duplicated by #4571. I'm marking this ticket as a duplicate for the sake of clarity.