Added transaction allow=readonly to all appropriate Share and Remote Service WebScript descriptiors.

- fixed up SiteService to create inner transactions as readonly where appropriate
 - tested Share with basic operations, may be some further issues that fall out

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@14672 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/site/SiteServiceImpl.java

@@ -548,7 +548,7 @@ public class SiteServiceImpl implements SiteService, SiteModel
                             
                             return results.get(0);
                         }
-                    });
+                    }, true);
                 }
             }, AuthenticationUtil.getSystemUserName());