Re-introduce DECFLOAT

JDBC driver issue was remedied by upgrading to newest version.
Create DB2iSeriesEnvironment

Separate Acceptance Tests
Remove iSeries specific syntax from DB2Tests
Revert DB2Environment.

Changes replaced by DB2iSeriesEnvironment
Remove properties files
Add DECFLOAT
Small cleanup tasks

Remove additional properties files and revert DB2Environment
Remove remaining iSeries types from DB2Environment
Whitespace issue
Merge pull request #2 from mikepatrick/iSeriesDbFit

Separate iSeries DB2 environment from Windows/Linux DB2 environment