fixed issue with silent death.

There was Format open module open, which outputed all data to a
formatter, that wasn't flushed.
Merge pull request #19 from ivg/readbin-error-output

fixed issue with silent death.
Add ByteWeight
Merge pull request #21 from tiffanyb/tables-review

merged, but create #22
Add ByteWeight to _oasis
Merge pull request #24 from tiffanyb/tables-review

Add ByteWeight to _oasis, will fix #23