Add a reminder for how to get the solr plugin working

htdocs/search/solr/readme.txt

+To install & activate the Mahara solr plugin using Solr 1.2 from the
+solr-tomcat5.5 debian package:
+
+For existing Maharas, make sure $cfg->searchplugin does not appear in
+config.php
+
+As admin, set searchplugin to 'Solr' in site options, and in plugin
+administration, set the Solr URL.  For tomcat this will usually be
+something like http://foo.com:8150/solr/.  For the jetty package, the
+default port is 8983.
+
+In the solr installation, edit /etc/solr/conf/solrconfig.xml.
+  Comment out
+  <requestHandler name="/update" class="solr.XmlUpdateRequestHandler" />
+
+  Change handleSelect to "false" in
+  <requestDispatcher handleSelect="true" >
+
+Copy the schema.xml file in this directory into /etc/solr/conf/ on the
+solr server.