work on unfinished asterisk channel driver (bchannel handling)

work on unfinished asterisk channel driver (bchannel handling)

	modified:   Makefile
	modified:   README
	modified:   action.cpp
	modified:   admin_server.c
	modified:   apppbx.cpp
	modified:   apppbx.h
	new file:   bchannel.c
	new file:   bchannel.h
	renamed:    asterisk_client.c -> chan_lcr.c
	renamed:    asterisk_client.h -> chan_lcr.h
	deleted:    channel.c
	modified:   dss1.cpp
	modified:   extension.c
	modified:   extension.h
	modified:   interface.c
	modified:   interface.h
	modified:   joinremote.cpp
	modified:   joinremote.h
	modified:   mISDN.cpp
	modified:   mISDN.h
	modified:   main.h
	modified:   message.h
	modified:   route.c
	modified:   todo.txt