[NUMBER-AS-LONG] Added better handling of numeric columns

[2ps]

Problem?

When exporting from an oracle database that uses a number column type for bigints, opencsv put .0 as a suffix to all the values, even though the values in the database were integer values.

Solution!

Added checking of the scale on numeric datatypes so that if we encountered a NUMERIC jdbc datatype / oracle number field, with 0 scale, we treat the value as long instead of double.