Added an index on "item_org_id" to speed-up the setup and the silo on organizations.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3246 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-attachments/datamodel.itop-attachments.xml

@@ -47,6 +47,11 @@
                <attribute id="item_id"/>
              </attributes>
           </index>
+          <index id="3">
+             <attributes>
+               <attribute id="item_org_id"/>
+             </attributes>
+          </index>
         </indexes>
       </properties>
       <fields>