Added Save/Save As support to Datasource #6
8000
Merged
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This required plumbing a filename through from the from_file classmethod and building an ElementTree to serialize into a file. This pretty much mirrors the Workbook model. I also removed the file validation check on save since we validate on instantiation already, at this point you know you have a 'twb/tds' open. Added a matching test.
Testing: Existing suite (up to 9!) on py2/3 on Windows/Mac.
Also opened the resulting file in Desktop and it's recognized.