MT#7037 Explicitely set packet size to 20ms
MT#4019 Implement C2D in api via /api/callcontrols
MT#7177 Implement callee normalization. WIP.
MT#7177 API: add /api/applyrewrites/ for rwr.

Normalize/denormalize a number based on the subscriber and the
direction.
MT#7177 API: also evaluate callee_xxx rwr vars.

Load the AVPs from the same subscriber as for caller, as we should
not intermix them anyways.
Treat non-existent vars as empty vars like kamailio does.
MT#7177 Fix REST API test (add callcontrols check)
MT#7543 First version of API tools.

Needs refactoring to put common stuff into one place, and source it
from there.
MT#7177 Fix REST API test (add applyrewrites)
MT#7177 Reorder REST test links alphabetically, removed duplicates
MT#7177 Restore missed contracts check, typo in 8082eec6
MT#7543 install API scripts in /usr/bin. Add manpages and some new options.