Fixes #21015 - sync host and hostgroup rabl to show all_classes

Fixes #20905 - Add message in audit in case no changes

Fixes #20705 - display paginations on audits page correctly

Fixes #20952 - Replace AC::Parameters Hash methods

Replaces any methods that used to be from Hash with the more limited
ActionController::Parameters API.

Fixes #20783 - Move Inline messaging regarding user saving first

within "Notification" fieldset

Fixes #19519 - Prevent autocomplete on LDAP account

Fixes #20949 - Replace deprecated AM::Errors usage

Fixes #20950 - Use 'distinct' in AR finders

Fixes #19047 - unify date formats

This introduces two new helpers for printing date in absolute and
relative format. Helper for absolute accepts also a parameter to choose
between long and short variant. The long one includes the year. The date
also has a title so you see the other format after hovering mouse...

Fixes #20897 - change description for 'default' to help tooltip