ROL-2019 switched tabs on stylesheet and template edit pages from YUI to YUI3; warning YUI3 requires lots of folders, I'm using the bare minimum of 53 (out of 370+) for what we are using.

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1609737 13f79535-47bb-0310-9956-ffa450edef68