databases/cego: 2.23.7 -> 2.23.8

• Simplification in CegoBTreeManager and CegoBTreeNode. Calculation of leaf node chain is now much simpler. This ensures consistency and improves btree build up performance.
• Fix for btree page count and btree page release. Some of the btree nodes have double references, which was not treated in the page count and page release algorithm.
• Changed default primary and secondary values for tableset definition command to the configured hostname. This simplifies the define command in case of single node tableset configurations.

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