Fix PHPOffice#3665. The original issue was the use of an absolute path in the rels file pointing to the comments file. That was easy to take care of, but a bigger problem with the spreadsheet accompanying the problem report was that it used unexpected spacing for AutoFilters and Tables. AutoFilters were already known not to be covered, but Tables appeared after the namespacing changes, but without namespacing support. This PR fixes the absolute path problem and adds namespacing support for Tables and AutoFilters.

Remaining areas which are still namespace unaware, mainly because of the absence of test samples which use them with unexpected namespacing, include conditional formatting (internal or external), sheet view options, sheet protection, unparsed loaded data, data validation (internal or external), alternate content, and header/footer images.

Node no longer exists, doesn't affect result. Suppress warning.

What would a change be without some new false positives?

A gift that keeps on giving :-( Now it's deciding that things that it didn't report in a scan from a few minutes ago are worth reporting, even with no relevant code changes.

It is an idiot. Let me see if I can fix one false positive and succeed in guessing where it might report another one, even though it didn't do so with this last run.