now LCR features real HDLC bchannel mode.

now LCR features real HDLC bchannel mode.
-> if initial caller uses pure data mode (or video), the bchannels for this call are handled in HDLC mode. (hardware/software briding is still applicable.)

	modified:   apppbx.cpp
	modified:   chan_lcr.c
	modified:   dss1.cpp
	modified:   dss1.h
	modified:   lcradmin.c
	modified:   lcrsocket.h
	modified:   mISDN.cpp
	modified:   mISDN.h
	modified:   message.h
	modified:   socket_server.c