add temp_hold_music var that is only valid until you transfer the call and finishing touches on bind meta to A-D

add auto-jitterbuffer-msec param and auto-disable the jitterbuffer when briding to another channel who also has a jitterbuffer so both legs will disable during a bridge

Freetdm - ISDN:Fix for progress indicator not set properly. Allow state change from RINGING to PROGRESS

Conflicts:
	libs/freetdm/src/ftdm_io.c
	libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_trace.c
	libs/freetdm/src/include/freetdm.h

freetdm: ftmod_r2 - set the FTDM_CHANNEL_USER_HANGUP flag right before changing chan state to FTDM_CHANNEL_STATE_HANGUP

                    replaced calls to ftdm_mutex_lock() with ftdm_channel_lock()