work on socket. (don't try yet)

work on socket. (don't try yet)

	modified:   Makefile
	modified:   apppbx.cpp
	modified:   bchannel.c
	modified:   dss1.cpp
	modified:   dss1.h
	modified:   mISDN.cpp
	modified:   mISDN.h
	deleted:    q931.h
	modified:   trace.h