ROL-2043 Switch from YUI3 to latest JQuery UI

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1614035 13f79535-47bb-0310-9956-ffa450edef68
Implemented site.allowUserWeblogCreation (how could we have missed that?)

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1614121 13f79535-47bb-0310-9956-ffa450edef68
ROL-2044 turn off ability for admin to remove himself from users page.

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1614350 13f79535-47bb-0310-9956-ffa450edef68