Refactored tabs.js to be 'universal' (instead of just for the Admin UI); fixed display (or lack thereof) of descriptions on select menus; minor style tweaks.

XNAT-4249: '...timed out...' message won't display on login page unless user's last session was terminated due to inactivity. Spawner changes: for 'href', 'src', and 'action' properties, values starting with */ will ensure the path starts at the site root; also added 'name' attribute to form panels.

XNAT-4210: Site Setup page works as requested (initialized:true) is set before showing the confirmation dialog, also moved site setup functions to /scripts/xnat/app/siteSetup.js; XNAT-4192: session timer works on all pages and DOESN'T RELY ON YUI ANYMORE; more reliable lookup of Spawner™ widget methods; added hooks in form input widgets to lookup a value via AJAX using syntax: 'value: ?$ /path/to/data | prop.name';

Site setup sets initialized:true before closing the modal dialog; site setup functions moved to /scripts/xnat/app/siteSetup.js; more reliable Spawner widget method lookup - won't freak out if it can't find a method for your widget; session timer works on JSP pages and, get this... DOESN'T USE YUI ANYMORE; enhancements to xmodal dialogs - add 'keep' class to prevent destruction of modal elements when triggering a .close; probably some other stuff...

Enabled loading and saving of data from form panels with use of 'load', 'method', and 'action' properties - see 'panel.form' elements in the 'site-admin-sample-new.yaml' file for examples. Pulling in the whole siteConfig object for populating properties in the admin ui. Other small javascript and CSS tweaks.

Updates for Spawner components: added panel.section, select.menu, select.multiple; support for 'before' and 'after' properties in YAML objects; now tab groups will not show unless they have at least one tab.

Adding starter files for working with the XNAT.spawner methods, which are different than the spawn() $('p').spawn() and $.spawn() functions!