Add the topicId to the list of filters
Make Help Topic singular
Add flag to forbid passwd changes by user

Useful if the staff members administratively configure a static password
that the user should never change.
registration: Allow staff to specify backend
Merge pull request #746 from greezybacon/feature/user-directory

More stuff for user directory

Reviewed-By: Peter Rotich <peter@osticket.com>
Throw error if relationship reverse is misconfigured
Add unset() support to model and ::reset() to instrumented list
orm: Refactor WHERE clause compilation
orm: Add bulk update compilation
orm: Fix setup of InstrumentedList magic properties
orm: Fix magic lookup of one-to-one relations
orm: Add ::count() and ::expunge() to InstrumentedList
email: Fix inline images sent in old HTML markup
Support inline images without a filename

Such images are attached to emails by Lotus Notes. Technically, these images
are valid attachments, although historically osTicket would reject them
Add topic selection to email (channel) management
Add help topic selection to filter actions
Implement help topic forms for all new tickets

(regardless of the source)
Initial concept of list properties
Merge pull request #747 from greezybacon/issue/orm-revisited

orm: Add several new gizmos and fix a few small issues

Reviewed-By: Peter Rotich <peter@osticket.com>
Prefer settings from the email address setup