Add comments with short module description on top of each file

Change-Id: Id934d7a763b619d52cbec7de439b3708225b81f3
diff --git a/library/IPA_Emulation.ttcn b/library/IPA_Emulation.ttcn
index 9bad69f..b40818f 100644
--- a/library/IPA_Emulation.ttcn
+++ b/library/IPA_Emulation.ttcn
@@ -2,10 +2,18 @@
 
 /* This module implements the IPA multiplex protocol on top of TCP, using the IPL4asp
  * test-port as provider.  It implements both client and server roles, as well was the CCM
- * handshake for establishing the identity of the client to the server.  It already knows
- * certain well-known sub-protocols such as A-bis RSL, MGCP and SCCP and transcodes messages
- * so the user can work with abstract data types rather than binary messages.  It handles
- * multiple packets inside one TCP segment */
+ * handshake for establishing the identity of the client to the server.  
+ *
+ * It already knows certain well-known sub-protocols such as A-bis RSL, MGCP and SCCP and
+ * GSUP.  IT hence transcodes messages so the user can work with abstract data types rather
+ * than binary messages.  It handles multiple packets inside one TCP segment.
+ *
+ * (C) 2017 by Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ */
 
 import from IPA_Types all;
 import from IPA_CodecPort all;