databases/cego: update 2.49.11 -> 2.49.16

• cgmkdb utility script: allows to set up advanced database parameters
• In CegoXMLSpace::addTableSeDef, added ARCHMODE attribute to set archmode to OFF as default
• Added querycache threshold parameter. Just queries with execution time greater than threshold value are cached. This leads to a lower stressed cache and avoids cache latency for those queries. Threshold is given in msec, which seems to be appropriate for now.
• Some memory leaks fixed
• fix cgadm (hang if INTR received while idle)
• Added query history for db threads. Not just the last action is indicated via admin command "threadinfo db threadId", but also the last n queries processed by this thread. History Length can be configured via new cego command line option dbthreadhist