Much nicer jump-to anchors

[andralex]

Example: http://erdani.com/d/phobos-prerelease/std_range_package.html

[ntrel]

I don't understand everything this pull does - what are DDOC_CLASS_MEMBERS etc for?

I see this refactors the listAnchors function more cleanly, but it also:

• Shows overload anchors (name.2)
• Stops sorting case-insensitively
• Means I'll have to rework Use hierarchical Jump-to links #726 (which is arguably more awesome than this pull AFAICT ;-))

[ntrel]

what are DDOC_CLASS_MEMBERS etc for

OK, I think I understand, they set the nesting level, and this pull hides non-top-level symbols. BTW You can check top-level status just by checking if the anchor has a dot followed by non-digit in it (and ignoring the leading dot).

[andralex]

@ntrel: right, and good point - that makes things easier and makes the whole nestingLevel unnecessary. Could you please make that improvement?

[ntrel]

Sure, will do.

[quickfur]

This PR has broken Phobos docs builds. If you clone a clean copy of dlang.org and phobos and build dlang.org then cd phobos; make -f posix.mak html, it will produce documentation pages with no content in phobos-prerelease. I'd revert this PR, but the github reverter seems to have trouble with this, as it appears to be conflicting with subsequent changes in the repo.

[ntrel]

@andralex Now done in #740.

@quickfur Hopefully fixed with dlang/phobos#2835, please test.