strip_tags_long: use htmlpurifier to properly reformat html content

lib/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.DefinitionID.txt

@@ -0,0 +1,11 @@
+URI.DefinitionID
+TYPE: string/null
+VERSION: 2.1.0
+DEFAULT: NULL
+--DESCRIPTION--
+
+<p>
+    Unique identifier for a custom-built URI definition. If you  want
+    to add custom URIFilters, you must specify this value.
+</p>
+--# vim: et sw=4 sts=4