localhost. In this way there is not need for the opaque information
        and encryption part.

        the necessary information i.e castor.pfn2 is filled in.
        Remove linking with libuuid which is not needed any longer.

        for the signature of the opaque info.

        close functions and refactor some of the error messages.

issue experienced in validation. Even with threading parameters milder than the ones commited, the problem could not be
reproduced in unit tests. This commit also adds an attempted workaround, which will serialize the once-per-disk-thread
xroot key reading. To be re-attempted in the stress tests.

The VDQM protcol is fragile.  A single network or database error (for
example a translucent upgrade) can put the vdqm out of sync with the
tape drives it controls.  This modification makes tapeserverd check
with the vdqm from time to time to see if everything is still
synchronised.  If it is not the case then tapeserverd now takes
proactive action to resync the vdqm.

plus refactored some xroot related code.

Further simplification of the fileclass tools around CASTOR-4830 : Several minor defects in documenting nsenter/nsmodifyclass : now the uid and gid are gone too

Prepared all creation/upgrade scripts for 2.1.15-0. The stager upgrade script still need to be amended to expand '@' expressions

Added a new m_moverHandlerPort member to the diskFileFactory class, so the new xroot-c2fs URLs can be implemented.
Propagated the value from castor.conf through the constructors of the DiskThreadPools and the DataTranferSessions.

a new composite transferTime (member function) which now matches better the previous definition of transfeTime.

Added the possibility to fake the backtrace in CASTOR Exceptions to have lightweight ones. Used it for the NoEntry exception

In particular all unused parameters of the fileclass are no more appearing on the command line tools and the default number of copies is 1

Migrations now abort in the presence of tape alerts.