- cell.r holds the raw rich text, cell.h now holds the html
(version 0.5.0 cell.raw -> cell.r, cell.r -> cell.h)
- similar changes to comments and XLSB generation
- removed some unused binary methods
- XLSB basic support for number formats
- removed extraneous Strings table element
- formatting xml tags (rich_stress_test)
- updating test_files to 20130130