tuple updates
added test, use abs(length) in some calcs
got rid of tab
more testing
even more testing
added another bigint test, output->output_already_ordered
added BigDecimal test
formatting
merge hchandl: Tuple2 BigDecimal/Integer encoding & ordering

Merge pull request #1432 from hchandl/sql-layer/tupleFixes
https://github.com/FoundationDB/sql-layer/pull/1432