I've broke this when re-commiting the changes made by Matthias and fixed
this by populating dependent pages directly in WebSetup::setupPage.
refs #7163
Checking one table for its existence is more than enough. Creating a diff
implies conditional CREATE TABLE instructions and the like, what we want
to avoid.
refs #7163
Not only the "setup_authentication_backend" page depends on the auth
type but also the "setup_admin_account" page, so just drop both entries
once a new auth type gets submitted.
refs #7163
Page config and dependency handling is implemented and works like a
charm. Though there is one known bug that occurs when navigating back,
taking changes and moving onward to a page that needs to update its
state due to the changes while adding some elements that have similar
names as the ones shown before. This is only an issue with hidden elements.
refs #7163
Johannes Meyer
Matthias Jentsch