[ ] Bugfix # 88 Using hyperlinks causes charts to break
[ ] Bugfix # 95 add row height and col width functionality
[ ] Bugfix # 97 adds pie charts and combination charts
[ ] Bugfix # 99 adds ticks around multi-word titles in chart references
[ ] Bugfix # 103
[ ] Bugfix # 152
[ ] Bugfix # 163
[ ] Bugfix # 172
[ ] Bugfix # 181
[ ] Bugfix # 184 support for right-to-left
[ ] Bugfix # 215 roundtrip sheetviews
[ ] Move all tests from /tests to relevant modules
[ ] Support named styles
[ ] Different, faster solution for immutable styles: either swap the class or use a proxy
[ ] Expose formatting objects directly, Style as namedtuple
[ ] Cleanup API and inheritance of IterableWorksheet / Worksheet
[ ] Improve handling of relationships
[ ] Do not write cached values for charts
[ ] Support cells with formulae in charts
[ ] Merge existing patches for charts
[ ] Default to using an iterator when working with charts?
[ ] Simplify Chart API
[ ] Support cell type "d" with W3C formatting
[ ] Make worksheets iterable (by row)
[ ] Implement workbook properties using descriptors and dictionary interface
[x] Both cell coordinate lookups as dict
[ ] Group utility functions in a single module