* Rename option ringback-during-collect to immediate-ringback
* Allow regular ringback tone with immediate-ringback, not just a wav file
* Do not request full frame of data, just packet_len which is what we receive per IO interval
* Ignore user data when playing ringback tone

Split naming of T.81/T.42 type JPEG from normal JPEG. This is in preparation
for allowing the selective output of normal JPEG (like most people want)
and the T.81/T.42 type you might want for forwarding as T.37

tables.

This reverts commit c21f65ac.

default T.42 illuminant, to see if the colours suit screens better.

This should be treated as experimental right now.

mod_rayo: move alias definition to config file, tweak console command completion to make testing easier

freetdm: Fix longstanding minor bug in ftdm_span_send_signal causing dial-regex in Analog modules to not work
         The return status of the signal callback was not being passed to the signaling module delivering the signal