Fix: Several fixes into boxes management: boxes was loaded twice, logs
were wrong, global conf missing.
Merge pull request #609 from FHenry/3.3

Add option to fecth extrafield even if extranal extrafield module is
Merge branch '3.3' of https://github.com/Dolibarr/dolibarr.git into 3.3
Fix: Removed warning
Fix: Move not stable feature as experimental. Disabled box by default
because there is still some bug (pgsl support, filters) and major
problem to solve (it slow down seriously Dolibarr, result not accurate
for some status).
Remove bad retrun parameters