Moved key column from access_control_list onto node

This eliminates several select statements issued while walking up the parent hierarchy
The V1.2.1 - V1.3 script has been updated and tested, but if you want to keep an existing 1.3, then:
  SET FOREIGN_KEY_CHECKS = 0;
  ALTER TABLE node ADD `acl_id` bigint(20) default NULL;
  UPDATE node node SET node.acl_id = (SELECT acl.id FROM access_control_list acl WHERE acl.node_id = node.id);
  SET FOREIGN_KEY_CHECKS = 1;


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2910 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/hibernate/Permission.hbm.xml

@@ -19,14 +19,6 @@
            <generator class="native" />
         </id>
 
-        <many-to-one
-               name="node"
-               class="org.alfresco.repo.domain.hibernate.NodeImpl"
-               unique="true"
-               not-null="true">
-            <column name="node_id" />
-        </many-to-one>
-         
         <set name="entries"
                inverse="true"
                lazy="false"