databases/cego{bridge}: 2.49.22 -> 2.50.2, 1.7.0 -> 1.8.1

cego:
- Added syntax expansion for group having clause to support
  advanced having conditions, e.g.
  SELECT a, sum(b), max(c) FROM t1
  GROUP BY a HAVING sum(b) > 10 AND max(c) = 100;
- Patch added for 'view condition evaluation' in
  CegoAttrCond::asConjunctionList, CegoSelect::setViewCond and
  CegoDistCursor::distSetup.
- Additional check added to CegoObjectManager to avoid duplicate
  table objects of different type ( e.g. Table t1 and View t1 ). Table
  objects are either native tables, views or aliases.
- For predicate export structure, changed from XML representation
  to native SQL syntax. This requires a dedicated Parser in CegoXPorter,
  which can handle predicate SQL representation, but saves lots of
  code, since all subsequent member classes of CegoPredDesc no more
  need to implement XML representation methods ( constructor,
  fromElement, toElement )
- Added stabilization patches for nested grouping select, e.g. in
  exists subselect. In CegoSelect::reset, for _selectMode == GROUPING,
  grouping space is resetted now properly.
- Added stabilization patches to CegoAction. Load statements for
  views, procedures, triggers and condition are treated regarding
  object allocation/free. These statements are for internal use only,
  so a database user receives a note message now
- Further improvements added in CegoQuery to give more detailed
  error information in case of exceptions
- In CegoTableManager, made some exception message improvements,
  instead of popping last message, the complete message stack is thrown

cegobridge:
- Support added for cego-2.50.x
- Fixes added for modified CegoAction::getSelect and
  CegoAction::getProcedure methods

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