Added queue buffer for chan_lcr sending faxes without interruption.

Use options "t:q250" for disabling mISDN_dsp and adding a 250ms delay.

	modified:   README
	modified:   bchannel.c
	modified:   bchannel.h
	modified:   chan_lcr.c
	modified:   chan_lcr.h
	modified:   select.c