Added first part of extended ipc support.

- Extended ipc tests
- Need to copy from ktcb-to-ktcb instead of ktcb-to-user
- Need to check flags of both ipc parties before ipc copy type.

tasks/test0/main.c

@@ -49,6 +49,9 @@ void main(void)
 
 	clonetest();
 
+	if (parent_of_all == getpid())
+		ipc_extended_test();
+
 	exectest();
 
 	while (1)