databases/cego: 2.26.11 -> 2.26.12

• cgsimload with 3 mio ops and 2 processes passed
• Fix in CegoBTreeCursor::getFirst, if pAttrCond == 0 and btree is empty, the method call tries to claim a zero datapointer
• Reorganization of CegoDistManager and CegoTabelManager, all methods, which are calling useObject/unuseObject are located in CegoTableManager class now.

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