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* Fixed problem with the CodeMirror textarea, which wasn't completely
disabled before.
* Fixed problem with the ``DBTEMPLATES_MEDIA_PREFIX`` setting, which defaults
now to ``os.path.join(settings.MEDIA_ROOT, 'dbtemplates')`` now.
In other words, if you don't specify a ``DBTEMPLATES_MEDIA_PREFIX`` setting
and have the CodeMirror textarea enabled, dbtemplates will look in a
subdirectory of your site's ``MEDIA_ROOT`` for the CodeMirror media files.