[v6r9] Fix fts for staging 2

This PR finally fixes the staging mechanism in the FTS transfer submission. In addition a few methods are being exposed by the TransferDBMonitoring service in order to inspect the status of files. 
It also sets 12 digits for the xxxTimeOrder (DB was operationally updated) as we reached 10^8 seconds since DIRAC's origin of times (not clear what it is). This gives us 30 years
Apologies as TransferDB.py was not beautified before...