The revision number is employed to represent each modification of the actual Gaudi II system, instead of the version number.
Until now, the modifications of the actual Gaudi II have been represented
by the version number (i.e. Ver2.0, Ver.2.11). On the other hand, the
modifications in the system design is also represented by the version number.
That makes confusion because the modifications in the system design are
not the same as those in the actual system, even if the version numbers
are the same.
From now on, the revision number is used for the actual system. It starts with '2.0'.
For example, "Gaudi II Rev.2.0". In short, "Gaudi R2.0".