Add Evcsn

Remove duplicate org.etsi.ttcn.common.ByteHelper.java file and replace it by org.etsi.common.ByteHelper.java after merge

Bug fixed in FacilitiesInd.java

Add CommsigniaLayer.receive() method

Add AcSecPrimitive/AcSecResponse support for CAM (DENM & GN to be done)

.  Implement additional TPs
.  Review of the PICS, TSS&TPs & PIXITs documents
.  Start validation using simulation
.      Minor bug fixed in TA
TODO: Logs should be commented later

This completes cleaning operation of r1821 by re-inserting non-STF455 specific changes in trunk

Reverting non STF455-specific changes trunk/javasrc (r1427 - r1432). 
Those changes:
 - have been manually duplicated in Security branch, causing massive conflicts upon merging the branch back in trunk. 
 - will be re-inserted by merging Security branch back in trunk (cf. next commit)