databases/cego: update 2.33.16 -> 2.33.18

• Method cleanup in CegoSelect.cc, also some irrelevant case is treated for grouping clauses in combination with distinct operator
• Added tablemanager parameter to CegoProcWhileStmt to catch query abort. In case of infinite while loops, this enables the db admin to abort procedure execution
• Optimization for CegoFunction::SETCOUNT procedure implementation added. Now this is an atomic operation, instead of calling getCounterValue.
• For this, also the CegoXMLSpace::setCounterValue method has been changed to return the current counter value return the current counter value

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