issue #5827

ldap_escape was added in 5.6 so no fallback is needed no that we require
 PHP>=5.6.

issue #5827

PHP now has an exponentiation operator ** that can be used instead of
 the pow function.

issue #5827

Instead of less readable func_get_args and call_user_func_array

issue #5827

Paste is disabled until something is copied.
Restore is disabled if there are no snapshots.

Had to add a small hack in managementFilter to avoid Exception about
 gosaGroupObject having no ACL in type role.

This allows to do tab filters and property column without having to
 create objects of each tab.
Adaptations will be needed in all plugins.
This also activates new management class for groups to test it with
 several object types.

We should look into add the filter as a static member of simplePlugin
 class to avoid having to build an object.
Maybe also take this opportunity to rework is_this_account workflow as
 well.

It seems the result of get_class needs to be stored in a var before
 accessing a static var in PHP 5.6
Also contains minor code cleaning.

It’s only saved in the session for now