Add new project role restriction to block task suppression

app/Model/ProjectRoleRestrictionModel.php

@@ -15,6 +15,7 @@ class ProjectRoleRestrictionModel extends Base
     const TABLE = 'project_role_has_restrictions';
 
     const RULE_TASK_CREATION    = 'task_creation';
+    const RULE_TASK_SUPPRESSION = 'task_remove';
     const RULE_TASK_OPEN_CLOSE  = 'task_open_close';
     const RULE_TASK_MOVE        = 'task_move';
 
@@ -27,6 +28,7 @@ class ProjectRoleRestrictionModel extends Base
     {
         return array(
             self::RULE_TASK_CREATION    => t('Task creation is not permitted'),
+            self::RULE_TASK_SUPPRESSION => t('Task suppression is not permitted'),
             self::RULE_TASK_OPEN_CLOSE  => t('Closing or opening a task is not permitted'),
             self::RULE_TASK_MOVE        => t('Moving a task is not permitted'),
         );