Updates for Archived on the Web

- Check for all language markers to determine if a page is archived or
not (handles the case where wrong language message is used).
- Additional French archived web page notice.
Allow for testcase profile specific data items for CLF testcases.
Update GC core subject thesaurus
Correct bug where some link objects are lost when parsing HTML content
Add support for Open Data Tool
New modules to implement Open Data dataset file checking
Check that python version is not 3.0 or greater (feed validator does not work in python 3).
Allow for binary data in CSV files (e.g. new-line in the cell content).
Check for very long (> 500 characters) title and heading text
Don't report zoom failure for fix size fonts as current browsers can handle this - WCAG_2.0-G142
If an <img> is inside a <figure>, the <fagcaption> can be used for the image alt text
Update release notes
Report Interoperability failure for web feeds that do not parse properly
Allow for empty entry page names