Chrome send "Connection: Upgrade" while FF has "Connection: keep-alive, Upgrade"

like the quirks we used to get using those with C++ have gone away.

images should now be correct. This is now close to supporting grey scale and
colour.

FS-5662 --resolve implement call pickup group functionality in mod_skinny. Currently treats callPickup and grpCallPickup identically, may revisit when I find out more about what's different between the two

Thanks-to: Mariusz Czułada <manieq.net@gmail.com>

The directions here anticipate planned improvements to our JIRA bot to
allow issues to be resolved by placing the JIRA directives in the body
of the commit message.

FS-5659 --resolve Add logging for spandsp dtmf detector when dtmf_verbose channel variable is set to true