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/ftmod/ftmod_r2/ftmod_r2.c

         export ftdm_current_time_in_ms to users
	 update testr2 to test non-blocking API (no waiting on indications)

use switch_zmalloc() instead of apr pools for short term storage, rename a couple of funcs to be clearer as to their purpose