Rename the Configuration menu to Admin and pull it up out of Tools

The admin configuration pages are unlike anything else in the Tools
menu, and the top-level menu will only show up for folks with
ShowConfigTab anyway.  Slightly flattening the menus makes them more
navigable.

The ShowConfigTab right keeps its name since there is no compelling
reason to change it.  Internal consistency is a weak argument since it
is unlikely to confuse us and has had a known meaning for quite some
time.  The benefit of keeping it is users who come across references to
ShowConfigTab in rt-users, the wiki, etc.  When they search for the
right in the UI, they can still find it.  The user-visible description
of the right _is_ updated to reflect the current menu name to provide
confirmation that it is the correct right.
Pull the Articles menu up out of Tools

It is also unlike any of the other items in Tools and deserves more
prominence.  For instances not using articles, the menu may be hidden by
revoking the new ShowArticlesMenu right.
Link the top-level Search menu to the ticket simple search

A functional and reasonable default for a common action like searching
is more useful than a sparse page of duplicate links.

This change increases the visibility of the full simple search page,
which, anecdotally, often seems overlooked.  A quick read of the simple
search explanation immensely increases the usefulness of the
ever-present search box.
Link the "Logged in as ____" menu item to the current user's summary page
$RT::MAJOR_VERSION, $RT::MINOR_VERSION, and $RT::REVISION

Provide conveniently split out subparts of the RT version.
Point out how to setup articles on article overview/search when no classes exist

With Articles more visible in the menus, it's helpful to have a pointer
to a place to start setting up classes and articles.  The criteria for
"not configured" is no enabled Classes.
Adjust menu labels and ids in tests to match the changes
Incorporate a mention of rights into the "articles needs setup" text
Use the standard "articles needs setup" widget on the Article create page
Add a Create link to the Articles menu
Update documentation for the new menu structure
Merge branch '4.2/menus'

Conflicts:
	docs/UPGRADING-4.2
	etc/upgrade/4.1.9/content
            Moved to etc/4.1.12/content
	share/html/NoAuth/css/base/articles.css
	t/web/html_template.t