This commit adds the backend support for a new style of tutorial which
allows for highlighting of multiple areas of the page with hotspots that
disappear when clicked by the user.
- Add message retention period field to organization settings form.
- Add css for retention period field.
- Add convertor to not negative int or to None.
- Add retention period setting processing to back-end.
- Fix tests.
Modified by tabbott to hide the setting, since it doesn't work yet.
The goal of merging this setting code now is to avoid unnecessary
merge conflicts in the future.
Part of #106.
This adds an organization description field to the Realm model, as well as
an input field to the organization settings template. Added three tests.
Set the max length of the field to 100 characters.
Fixes#3962.
On reloading the page after disabling email changes does not check
the "Prevent users from changing their email address".
Adding realm_email_changes_disabled to page_params_core_fields fixes the problem.
Change applies to both subdomains and non-subdomains case, though we use
just the EXTERNAL_HOST in the non-subdomains case if there is only 1 realm.
Fixes#3903.