Fix pubrules errors and warnings (#684).

[skynavga]

Closes #684.
Closes #686.

[skynavga]

@nigelmegitt all pubrule errors have been addressed; please approve

[nigelmegitt]

The W3C Link Checker has found these broken fragment IDs:

error Lines: 720, 1568, 3924, 4700, 7153, 7156, 9425, 9428, 9848, 9850 https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html
    Status: 200 OK

    Some of the links to this resource point to broken URI fragments (such as index.html#fragment). 
    Broken fragments:

        https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html#weight-attribute-fontWeight (lines 9425, 9428)
        https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html#document-layout-vocabulary-region (lines 4700, 7153, 7156)
        https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html#document-layout-vocabulary-tt (line 3924)
        https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html#content-attribute-conditionalization (line 1568)
        https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html#style-attribute-rubyAlign-withBase (lines 9848, 9850)
        https://rawgit.com/w3c/ttml2/issue-0684-pubrules-build/index.html#semantics-procedure-construct-effective-validation-schema (line 720)

It also found permanent redirects that we should fix - many are just to do with rawgit, but the ones that are actually relevant are:

 Lines: 11781, 11786 http://www.ce.org/ redirected to https://www.cta.tech/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

warning Line: 8751 http://www.w3.org/wiki/TTML/RoleRegistry redirected to https://www.w3.org/wiki/TTML/RoleRegistry
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

warning Lines: 11759, 11760 http://www.w3.org/TR/css3-fonts/ redirected to http://www.w3.org/TR/css-fonts-3/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

warning Line: 347 http://www.csail.mit.edu/ redirected to https://www.csail.mit.edu/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

Lines: 11750, 11751 http://www.w3.org/TR/css3-background/ redirected to http://www.w3.org/TR/css-backgrounds-3/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

 Line: 8764 http://www.w3.org/wiki/TTML/ItemNameRegistry redirected to https://www.w3.org/wiki/TTML/ItemNameRegistry
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

 Lines: 11762, 11763 http://www.w3.org/TR/css3-break/ redirected to http://www.w3.org/TR/css-break-3/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

Line: 347 http://www.ercim.eu/ redirected to https://www.ercim.eu/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

Lines: 11614, 11617 http://www.gps.gov/technical/ redirected to https://www.gps.gov/technical/
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

Lines: 11636, 11801, 11805, 11808 http://www.iso.org/ redirected to https://www.iso.org/home.html
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated. 

They don't cause a pubrules failure, but the pubrules checker strongly advises fixing them. Probably best just to fix here rather than open a separate issue.

[nigelmegitt]

We should also invite comments to be raised as issues directly on the ttml2 repo, with a link.

[nigelmegitt]

I've raised that as #686.

[nigelmegitt]

@skynavga @cconcolato I think this being unmerged and unresolved will prevent @plehegar or @tmichel07 from completing the transition request - are either of you able to make the fixes today please?

[skynavga]

@nigelmegitt @cconcolato I am working on this today but this will not prevent the transition request. Editorial changes are always permitted up to the instant of publishing.

[skynavga]

@nigelmegitt @cconcolato updated now, awaiting travis (very slow) to verify pubrules are happy

[nigelmegitt]

Passes pubrules and link checker now, thank you @skynavga ! (remaining task for @plehegar is to change index.html to Overview.html and do a final run-through as usual)