Documentation: Enhance left navigation area to always display complete tree.

[amitmurthy]

In the documentation pages, for example in http://docs.julialang.org/en/release-0.1/manual/ ,

the left navigation area only shows Current Topic (with immediate nodes), Prev Topic, Next Topic and a Search box.

Suggest to replace Current, Prev and Next with the complete documentation tree, where any section at any level can be collapsible, i.e., if one chooses, direct links to all the pages in the documentation is always visible.

[ViralBShah]

I have often found myself wanting to jump to any section of the manual. It would be nice to have the full collapsible ToC in the sidebar, if such a thing is possible with readthedocs.

[pao]

I think this is a good idea.

See also #2123, #2147.

[vtjnash]

This is probably possible. However, I don't think it is a generally good idea. We have a large number of subsections (tens? hundreds?), which I think would quickly become unwieldy if expanded. The search bar is readily accessible for all other queries. Thus, I propose this be closed. Or we could add a separate table-of-contents page -- that should be very easy with sphinx TOC markup.

[ViralBShah]

I think it would be nice if the navigation bar simply had the entire ToC at Chapter level and section level expanded for the chapter that is being viewed. Subsections is not really necessary.

[nolta]

This is pretty much implemented now.