databases/cego: upgrade 2.44.7 -> 2.44.8

• Added method CegoClient::treateEscape to handle escacpe charaters in command strings for interactive and batch mode ( newline, carriage return und tab )
• Further optimization in CegoFunction::getReturnTypeLen, if the length argument in left, right substr function is a constant, this value is used for schema definition, otherwise the length of the source is used. Example: select left(a,3) from t1 => length 3 is used for schema select left(a,b) from t1 => definition of a is used for schema Further optimization done in CegoSelect and CegoAction for schema evaluation.

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