[newforms-admin] Add an option to `ModelAdmin`: section_name

[yi.codeplayer at gmail dot com]

Currently, admin interface use app label to group models into sections and use app label as the section name, but i think use a admin option to specify the section name would be more flexibly (e.g. you can use non-ascii character in the option but can't do that in app label, and the models in the same app can be displayed in several sections).

I named this option as section_name currently.

If not specified, the value of section_name is the same as app_label.

I've been using this feature widely, and i hope it can be accepted.

[Petr Marhoun <petr.marhoun@…>]

I like this patch very much. I use it and I hope it will be accepted. But I think there should be capfirst and not title:

In [1]: from django.utils.text import capfirst

In [2]: capfirst('My application')
Out[2]: u'My application'

In [3]: 'My application'.title()
Out[3]: 'My Application'

In [4]: capfirst('URLconf information')
Out[4]: u'URLconf information'

In [5]: 'URLconf information'.title()
Out[5]: 'Urlconf Information'

[jkocherhans]

This would require you to put section_name all over the place, and would end up in a lot of duplication. Also, I think there is a better solution for this as part of #3591. Please bring this up on django-dev if you want to plead your case.