Log Message:
Update to 2.7

* Add dependency to php-mysqli

Changelog:
2.7
* Language translation and date format support for all modules.
* Ability to switch on/off modules.
* Upgraders up to version 2.6.5.
* Removal of Benefits module.
* bugfixes

2.7-rc.1
* Language translation and date format support for all modules except
  Benefits module.
* Ability to switch on/off modules.
* bugfixes

2.6.12.1
* bugfixes

In detail, see new_changed_features.txt, but no security bug information
is provided.