Fixed #2166 -- (take two!). Use "manage.py reset ..." to reset a model's

If I make changes to a model, how do I update the database?

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If you don't mind clearing data, just pipe the output of the appropriate

``manage.py sqlreset`` command into your database's command-line utility.

For example::

If you don't mind clearing data, your project's ``manage.py`` utility has an

option to reset the SQL for a particular application::

    manage.py sqlreset appname | manage.py dbshell

    manage.py reset appname

``manage.py sqlreset`` outputs SQL that clears the app's database

table(s) and creates new ones. The above command uses a Unix pipe to send the

SQL directly to the database command-line utility, which accepts SQL as

input (``manage.py dbshell`` will launch the appropriate tool for the database

configured in ``settings.py``).

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,