Changes

Adding a way to compute routes sequentially by defining `HIGH_DEPTH_ROUTING_ALGORITHM`.
This algorithm should be more efficient for nested zones.

Refactoring and fix some missing bypassroute resolutions, and unwanted redundancies in routes links.
tests corrected :
 - 455 - s4u-clusters-multicpu-thread
 - 456 - s4u-clusters-multicpu-boost
 - 457 - s4u-clusters-multicpu-raw
 - 458 - s4u-clusters-multicpu-ucontext
 - 643 - tesh-parser-bypass
All tests are now passed.

fix links order in routes

fix 'Moving a temporary object prevents copy elision'

Add test for the new routing algorithm with asymetrical nested zones

Rename get_englobing_zones to get_all_englobing_zones to avoid confusions.

Minor edit of some comments.

Minor exception log edit

Refactoring the routing algorithm to be more understandable.

Work around a gcc bug even if the warnings are not enabled

Fix make distcheck

let new test use the new API

gitlab ci: always cache the ccache, even on error

gitlab CI: add a proper key to retrieve the gitlab cache

gitlab ci: use the local docker registery instead of hammering transcontinental cables

gitlab ci: Actually trigger the docker_build job

grmbl

Rebuild the docker image everytime, but after pulling it to use the docker caching mechanisme

remove some stuff from the build-deps image to speedup builds

The resulting image cannot build the website nor the documentation,
but that's OK

cache the docker image of the intelCC to survive when intel breaks their repo (and to speed things up)

Fix some typos around the docker image of intel CC

docker's bummer

try harder to not rebuild the docker file when it's not needed. It's getting ugly

time to sleep :(

I hate alpine and I hate busybox

add freebsd runner

typo in variables