Fixed #17129 - Model FAQ: Link to south

This drops any tables associated with ``appname`` and recreates them.

If you do care about deleting data, you'll have to execute the ``ALTER TABLE``

statements manually in your database. That's the way we've always done it,

because dealing with data is a very sensitive operation that we've wanted to

avoid automating. That said, there's some work being done to add partially

automated database-upgrade functionality.

statements manually in your database.

There are `external projects which handle schema updates

<http://djangopackages.com/grids/g/database-migration/>`_, of which the current

defacto standard is `south <http://south.aeracode.org/>`_.

Do Django models support multiple-column primary keys?

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