jQuery UI Dialog prevents page scrolling with the scrollbar when a modal dialog is active

This patch to addresses a jQueryUI bug. The bug is responsible for the inability to scroll a page with the scrollbar when a modal dialog is active. If the content of the dialog extends beyond the bottom of the viewport, the user is only able to scroll with a mousewheel or up/down keyboard keys.

@see http://bugs.jqueryui.com/ticket/4671
@see https://bugs.webkit.org/show_bug.cgi?id=19033
@see /js/jquery.ui.dialog.min.js

The javascript patch overwrites the $.ui.dialog.overlay.events object to remove the mousedown, mouseup and click events from the list of events that are bound in $.ui.dialog.overlay.create.

views_ui.module is updated to include views_ui_library_alter that adds the javascript patch when the version of ui.dialog is greater than 1.7.2, when this bug was introduced.