databases/cego: 2.49.6 -> 2.49.7

• Fix added for CegoXPorter / CegoAdminThread / CegoBufferPool to treat locking issue during tableset / table import. Since the pool is locked during import ( by new introduced method lockPool ), no further locking calls must occur during import. For this, log writing is disabled before lockPool is called and CegoBufferPool::logIt checks for active log ( via new isActive method ) before trying to get a lock.