all instances of putting guest user in auth principal. Modified filters
to consider null and guest as anon.

XNAT-4208 - Admin UI needs help indicators or descriptions, XNAT-4248 - passwordExpirationType should be a set of radio buttons, XNAT-1649 - Archive mount point is missing, but system runs without a message

Updated jQuery 1.x and jQuery migrate scripts; removed jQuery 2.x files since they weren't used; changed name of 'chosen' menu functions to a more generic name for future transition to another menu widget.

XNAT-4209 Added four pages for the different ways of uploading data, in addition to a main page that lists all of them. Also listed the options in a submenu under Upload->Images.

Added /setup files; added panel.multiForm widget that will submit and reset all child <form> elements; style tweaks for panel.form and panel.multiForm widgets.

Modified CSS and HTML structure to make the the user bar and main nav use the full window width; removed the gray background from the body; other miscellaneous updates.

Modified CSS so the user bar and main nav containers at the top of the page span the width of the browser window and removed the gray background from the body; shuffled page elements for new styling.

HTML updates for style changes; added menu where stored searches will eventually end up; consolidated includes for the footer into a single location; re-enabled left-hand tree code to use the JavaScript; removed references to jQuery UI since we're no longer using it.

XNAT-3910, XNAT-3918, XNAT-4030: MAJOR UI CHANGES! NEW topBar nav menu and user bar; many, many tweaks to styling; removed a bunch of <table> elements that were used for layout; tweaked CSS to account for that; updates to 3rd-party JavaScript libraries (but rolled back jQuery to 1.12.0).

integrate gradle-xnat-plugin and work out configuration for Cargo deploy
tasks.