Xlrd-ignore-writeaccess-corruption

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- Fix more packaging issues.

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- Fix packaging issue that missed ``version.txt`` from the distributions.

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- More tolerance of out-of-spec files.
- Fix bugs reading long text formula results.

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- Packaging and documentation updates.

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- Tolerant handling of files with extra zero bytes at end of NUMBER record.
Sample provided by Jan Kraus.
- Added access to cell notes/comments. Many cross-references added to Sheet
class docs.
- Added code to extract hyperlink (HLINK) records. Based on a patch supplied by
John Morrisey.
- Extraction of rich text formatting info based on code supplied by
Nathan van Gheem.
- added handling of BIFF2 WINDOW2 record.
- Included modified version of page breaks patch from Sam Listopad.
- Added reading of the PANE record.
- Reading SCL record. New attribute ``Sheet.scl_mag_factor``.
- Lots of bug fixes.
- Added ``ragged_rows`` functionality.

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- Backed out "slash'n'burn" of sheet resources in unload_sheet().
Fixed problem with STYLE records on some Mac Excel files.
- quieten warnings
- Integrated on_demand patch by Armando Serrano Lombillo