add auth context to every form

this leaves a record of what kind of auth was used for the form
currently just in the auditing phases
test ?authtype=digest is same as default
Merge branch 'master' into authcontext
Rename existing mailing list stuff

Since we're not really giving people the ability to "opt in" on this, it
seemed confusing to leave the code structured like that. Now we can just
check if they have not opted out to determine if we can send mail.
Add ability to send mailing list type messages
Add unsubscribe link
Add message about unsubscribing
Commit for testing mailing list
Mailing list tweaks
Update email templates to better handle html
Merge branch 'master' into authcontext
Change copy for user facing mailing list stuff
Remove test email data - We'll do it live!
Update unsubscribe info message
Merge branch 'master' into mailing-list

Conflicts:
	urls.py
Refactor unsub info message
Merge pull request #744 from dimagi/authcontext

add auth context to every form
add back adm navigation hack that was still needed
Merge pull request #807 from dimagi/adm-navigation

add back adm navigation hack that was still needed
honor translations for module names in subcase ui