this recovers 'hang' of bchannel if the reply message got lost due to buffer overflows
fixed some minor warnings
modified: Makefile
modified: README
modified: action_efi.cpp
modified: apppbx.cpp
modified: dss1.cpp
modified: interface.c
modified: mISDN.cpp
modified: mISDN.h
modified: message.h
modified: Makefile
modified: README
modified: action_efi.cpp
modified: main.h
new file: tones_efi/benutzerdefinierte.isdn
modified: tones_efi/die.isdn
new file: tones_efi/hello.isdn
new file: tones_efi/ich_wiederhole.isdn
new file: tones_efi/rufnummer_lautet.isdn
new file: tones_efi/unterdrueckte.isdn