oc: Query for fmids in behalf of owner's resource

Instead of using connected active user because the fmids are related
to the root folder (context) owner. This avoids returning back incorrect
identifiers which mostly collide with already associated URLs.

OpenChange/MAPIStoreMapping.m

@@ -258,7 +258,7 @@ MAPIStoreMappingKeyFromId (uint64_t idNbr)
   if (oldURL != NULL)
     {
       [self errorWithFormat:
-	     @"url with idNbr already registered: (oldUrl='%@', newUrl='%@', id=x%.16"PRIx64")",
+	     @"url with idNbr already registered: (oldUrl='%@', newUrl='%@', id=0x%.16"PRIx64")",
 	     oldURL, urlString, idNbr];
       return NO;
     }
@@ -306,7 +306,7 @@ MAPIStoreMappingKeyFromId (uint64_t idNbr)
     }
   else
     [NSException raise: NSInvalidArgumentException
-                format: @"number of urls and ids do not match"];
+                format: @"number of urls (%d) and ids (%d) do not match", max, [idNbrs count]];
 }
 
 - (void) unregisterURLWithID: (uint64_t) idNbr