2.4.22 major fix

Fix wait issue on closing channel
Fix file length = 0 as an error
Improve SpooledDirectory with parallelism on main action and controlling parallism
Fix condition of closing network connections by setting lastTimeUsed
Fix shutdown and restart processus
Fix thread handling, in particular for Business requests
Various small fixes
Add Unzeroed task for file with 0 length
Add Support for WebAdministrator login with limited rights
Add dynamic i18n support on server and web interface: fix the request #86