- update FilterDatabase defined name when writing AutoFilter
- XLML stub cells have blank Data block
- HTML export honor `id` option
- expose `sheet_get_cell`
- browser demo save file in global (fixes#573 h/t @WildDusk)
- flesh out XLSB record expectations (fixes#624 h/t @pgeeh)
- `dense` mode (fixes#34 h/t @schleumer)
- chartsheets are now stored as sheets with "!type" set to "chart"
- fixed Strict XML Workbook Relationships
- stubbed support for dialog and macro sheets
- removed legacy XLS `!range` field