Arvados

When navigating inside Workbench (at least sometimes, but ideally always), the top nav should stay stable and the page content area should indicate "loading". (Currently, after clicking a link, the user experiences a delay, then the entire page goes blank, then the next page appears.)

An easy strategy to solve [most of] this problem is to replace regular links with Javascript code to

1. Display "loading" indication,
2. Do an AJAX call to load just the "body-content DIV" part of the desired page,
3. Replace the current body-content div with the new one.

The "wiselinks" gem can do most of this work for us, and lets us enable it selectively so we don't unwittingly break a bunch of stuff (which is what will happen if we turn on "turbolinks").

Caveats:

• This tends to break the javascript-embedded-in-page pattern (especially (only?) with content_for :footer_js). Temporary solution: don't use wiselinks when linking to pages that use that pattern. Long term solution: Don't use the javascript-embedded-in-page pattern.
• Also won't play well with "change breadcrumbs depending on which page you're looking at" system