added ftdm iostats command

add NDLB-allow-nondup-sdp to indicate you want to parse a differnt sdp in 200 ok from 1xx (previous default) this is a RFC violation so I decided not to support it by default anymore.  Enable this if you want that broken behaviour

addressed issue with multiple GRS at the same time in a single span
revisions merged: afcc831d6fa1fccaf7ef091b8c48b905a76d834d 9c815c9ecd7102e7d30c3988cd41682b8cbade0b

add new detailed_calls view a version of the channels table that shows only one legged calls or bridged calls

See also FS-3425

Conflicts:
	libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_trace.c

mod_callcenter: Quick fix againt major loop in wait time is set to 0 and the phone is not registred.