* deprecated WikiEngine.getRequiredProperty( props, key ) in favour of 
   TextUtil.getRequiredProperty( props, key ). The former will be deleted in 2.10 scope
   
 * new API package org.apache.wiki.api.engine, intended to hold WikiEngine, its managers and
   related classes. FilterManager and PluginManager moved there (cfr. JSPWIKI-155, JSPWIKI-303
   and $SVN/trunk/doc/2.10-API.txt).

git-svn-id: https://svn.apache.org/repos/asf/incubator/jspwiki/trunk@1431026 13f79535-47bb-0310-9956-ffa450edef68