GH-80 Changes based on code review
Normalize casing in ECLFunction ctor
Added and use final static default values for colum chars, and decimal digs
Create numeric precedence map, and access method
Fixes SQLEXception issues where column index is not displayed in HPCCResultsetmetadata

Signed-off-by: Rodrigo Pastrana <Rodrigo.Pastrana@lexisnexis.com>