Big admin refactor

app/Resources/SonataAdminBundle/views/layout.html.twig

app/config/config_sonata.yml

app/config/services_admin.yml

...onata/UserBundle/Form/Handler/RegistrationFormHandler.php

src/Biopen/CoreBundle/Admin/UserAdmin.php

src/Biopen/CoreBundle/Controller/UserController.php

src/Biopen/GeoDirectoryBundle/Admin/CategoryAdmin.php

...pen/GeoDirectoryBundle/Admin/Element/ElementAdminList.php

...GeoDirectoryBundle/Admin/Element/ElementAdminShowEdit.php

src/Biopen/GeoDirectoryBundle/Admin/ImportAdmin.php

src/Biopen/GeoDirectoryBundle/Admin/OptionAdmin.php

...open/GeoDirectoryBundle/Block/BulkActionsBlockService.php

src/Biopen/GeoDirectoryBundle/Block/ChartBlockService.php

...oDirectoryBundle/Block/MonitoringElementsBlockService.php

...n/GeoDirectoryBundle/Block/RecentElementsBlockService.php

...oller/Admin/BulkActions/BulkActionsAbstractController.php

...roller/Admin/BulkActions/DataQualityActionsController.php

...troller/Admin/BulkActions/DataUpdateActionsController.php

...oller/Admin/BulkActions/DbMigrationsActionsController.php

...troller/Admin/BulkActions/DuplicatesActionsController.php