Also added display of migration to stdout when verbosity=3.

Fixed create_default_site() to use a default value in case
settings.SITE_ID isn't set; refs #23945.

Refs #24354 -- Prevented repointing of relations on superclasses when migrating a subclass's name change

Forwardport of test and release note from stable/1.7.x

Thanks gbdlin for the initial patch and Tim Graham for the review.

Thanks Max Demars for the suggestion and Tim Graham for the review.

Prefix was treated as a part of the url pattern, which it is not.
Improved tests to conform with RFC 3986 which allows certain
characters in path segments without being escaped.

Propagated unnamed arguments as positional arguments into included
URLconfs if no named arguments are defined. Positional and keyword
arguments are never combined.

The JavaScript may be required when using ModelAdmin.get_actions() or
get_prepopulated_fields(). Always including them is the easiest solution.

setup.py adds these spaces when distributing.