databases/cego,devel/lfcbase: update 2.52.17 -> 2.52.18, 1.21.7 -> 1.21.8

lfcbase:

• BigDecimal::scaleTo: added RoundMode parameter which can either be UP ( round up ) DOWN ( round down ) HALFUP ( round up if neigbours equidistant or higher ) or HALFDOWN ( rond down if neighbors are equidistant or lower )

cego:

• Added support for lfcbase-1.21.8 ( BigDecimal::RoundMode ), Round mode ist setup in dbxml via database ROUNDMODE attribute ( either UP, DOWN, HALFUP, HALFDOWN )