Fixed #14355 -- Ensure that help_text is displayed for readonly fields in the...

Fixed #14355 -- Ensure that help_text is displayed for readonly fields in the admin. Thanks to jester for the report, and to alexbmeng, subsume, wamberg and Julien Phalip for ther work on the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15582 bcc190cf-cafb-0310-a4f2-bffc1f526a37