Implemented first, simplistic version.
Improve reporting for missing hashtag row.
Don't stop on empty row.
Fix imports.
Don't throw exception on a bad integer or a missing regular expression.
Added first unit tests for command functions.
Return result of validation from the command script.
Add callback to control output.
Fix bad indentation that kept pattern test from running.
Capture error output during testing.
Handle out-of-range condition where there are more data cells in a row
than there are headers.
Add a lot of documentation.

Fix IndexError for HXLRow.getAll()

Add HXLDataset.__str__()