This method allows to quickly check if the given policy version is
marked as optional or compulsory. This will be needed in other places
such as permissions check.
The patch adds a new column to the database table to hold the
information if giving agreement to the policy is compulsory or optional.
The flag can be defined via the policy editing form and is displayed at
the policies management screen.
The last modified time merged with the version column at the policies
management screen to save a bit of horizontal space - needed as we
display more information now at the first column.
The patch introduces a new property of a policy document called
"Agreement style". It allows the admin to define if the policy should be
accepted together with all others on the consent page (legacy and
default behaviour) or on its page before the consent page is reached
(the new optional behaviour).
David Mudrák