fixes, screen in and out works, fixed release problem in mISDNuser

fixes, screen in and out works, fixed release problem in mISDNuser
	modified:   Makefile
	modified:   README
	modified:   action.cpp
	modified:   apppbx.cpp
	modified:   apppbx.h
	modified:   dss1.cpp
	modified:   extension.c
	modified:   interface.c
	modified:   interface.h
	modified:   main.c
	modified:   port.cpp
	modified:   tones.c
	modified:   trace.c
	modified:   trace.h