databases/cego: update 2.54.25 -> 2.54.29

• fix in CegoBTreeValue::valueToFVL
• log mesage cleanup done for CegoRecoveryManager, CegoQueryManager and CegoTableManager.
• Changed return code of CegoBufferPool::writeCheckPoint to int to return the exit code of the optional escape command. This exit code then is indicated in the admin console
• Consolidation work done for CegoTableManager and CegoAuthManager
• Code reorganization for CegoAuthManager, CegoQueryManager and CegoTableManager: TableManager contains low level data access methods, QueryManger contains high level access and AuthMenager contains authorized access methods
• Post patch for this version : In CegoFieldValue::castTo, changed __dateFormatLock to writeLock. This is needed, since with readlock the _dateFormatList could be traversed in parallel by the Datetime constructor. This may lead to concurreny issues

Author: Björn Lemke <lemke@lemke-it.com>