- blank cells are omitted or stubbed (fixes #770 h/t @doxma)
- bare equals signs are interpred as strings
- CSV / TSV determination based on frequency (fixes #732 h/t @nknapp)
- HTML DOM Element and CSV tests
- XLS do not leak XF and index (fixes #782 h/t @the-spyke)
- cellText and cellNF apply to CSV (fixes #781 h/t @the-spyke)