Conflicts:
	src/main/webapp/xnat-templates/screens/Login.vm
	src/main/webapp/xnat-templates/screens/Register.vm

XNAT-4557 XNAT-4558 Added admin user and email to site admin. Fixed various handler methods to work better. Fixed issue where XnatAppInfo croaked when instantiated without manifest present.

notification preference change handling to SmtpHandlerMethod.

XNAT-4242: form validation errors will stop submission and display a dialog listing fields that need to be corrected.

XNATX-501: removed default 'Select' option from Spawner-generated menus; fixed an error with getting length of an undefined value; utility style classes: center/centered, align-left/text-left, align-right/text-right, nowrap/no-wrap; added 'sprite.png' file back to YUI folder - some YUI widgets still need it.

XNAT-4544: tweaked xmodal styles and defaults so buttons stay in the browser viewport and adjusted height of script editor dialog.

XNAT-4553 Allowed XNAT admins to configure auth providers via properties files in the config directory instead of just via properties files in plugins.

Removed styles for h1-h4 elements inside xmodal dialogs - these should be set elsewhere for the specific content.

XNAT-4533, more: Added Plugin Settings page - 'Administer > Plugin Settings' menu option will show when there's an installed plugin that has site-wide settings. The mechanism for this is clunky and could be improved if there was a way for plugins to register themselves as having site-wide settings. Split up items in 'Administer' menu for more granularity in inserting menu items. Other refactoring to support these features, including a new panel.form contentType option 'text/json' that submits JSON as text (needed for XSync plugin). (WHY!?)

messaging.