Fixed a bunch of spurious imports, typos, and other small errors turned up by a pass through PyFlakes. This covers about the first third of the errors.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3411 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management.py

@@ -593,7 +593,6 @@ install.args = APP_ARGS
 def reset(app):
     "Executes the equivalent of 'get_sql_reset' in the current database."
     from django.db import connection, transaction
-    from cStringIO import StringIO
     app_name = app.__name__.split('.')[-2]
 
     disable_termcolors()