databases/cego: update 2.39.14 -> 2.39.15

• Fix in dbcheck/expimpcheck, test plan was not set up correctly In CegoXPorter and CegoExpImpStream, row export information was added again to indicate overall row export for each table
• Fix added in CegoDbThread::serveRequest ( GETBLOB and GETCLOB case ) and CegoTableManager::getBlobData / getClobData chunkSize calculation. The existing calculation did not treat every boundary case.

Submitted by: Bjoern Lemke <lemke@lemke-it.com>