devel/lfcbase,databases/cego: update 1.16.5 -> 1.16.6, 2.47.27 -> 2.47.29

lfcbase:

• Added new method BigDecimal::scaleTo to change scaling for an instance. This includes an appropriate rounding, if scaling is reduced

cego:

• In CegoFieldValue::castTo, cast from varchar to fixed is done now with newly introduced BigDecimal::scaleTo method This includes an appropriate rounding in case of precision reduction.
• Fix in CegoCaseCondition to allow null types in condition see dbcheck/check106.sql for a sample