Addition of button that copies the current collection to a specified project (refs #3114, #3476)
Not positioned anywhere yet: I just slapped it onto the top of the page.
Merge branch 'master' into 3114-copy-to-project
Make Collection page's Copy into project use the standard chooser (refs #3114, refs #3476)
Also bug fix: now creates a copy of the link rather than the collection.
Also moved to the tab_line_buttons panel.
3114: bug fix: 'Copy' button is now disabled until a project has been selected for copying to
3114: When current user, show root/home project rather than user attributes when landing on show user page.
(This is meant to be a compromise due to the fact that a home project's uuid has "user" as its arvados type, rather than "group".)
3114: bug fix: when rendering JSON response to a generic #show action, correctly set an 'href' attribute in the response to be the #show url for the object
3114: Fix href in json response for generic #create action too. See 7485476.
3114: Merge branch 'master' into 3114-copy-to-project
3114: Update test case: searching for own uuid now shows home project.
3114: Follow return_to param, if given, when redirecting users#show to projects#show.

Don't redirect non-html requests.
Merge branch '3114-copy-to-project' closes #3114