Modify HTML multi-col test file to be more stressing
Change multi-col handling to leave vals as strings for TableOutputter
Add a table row with a string but no data elements
Simplify logic for selecting table rows
Fix to set blank data values as missing
Add test of informative error if table id not found (currently failing)
Add sanity-check tests of column name handling
Remove unused imports
Merge pull request #2 from taldcroft/html-reader-tla

Merged HTML reader changes