added the same htmlRead APIs than their XML counterparts new parser

* HTMLparser.c testHTML.c xmllint.c include/libxml/HTMLparser.h:
  added the same htmlRead APIs than their XML counterparts
* include/libxml/parser.h: new parser options, not yet implemented,
  added an options field to the context.
* tree.c: patch from Shaun McCance to fix bug #123238 when ]]>
  is found within a cdata section.
* result/noent/cdata2 result/cdata2 result/cdata2.rdr
  result/cdata2.sax test/cdata2: add one more cdata test
Daniel
diff --git a/result/cdata2 b/result/cdata2
new file mode 100644
index 0000000..b4db791
--- /dev/null
+++ b/result/cdata2
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<collection>
+  <test><![CDATA[
+    <![CDATA[abc]]]>]&gt;<![CDATA[
+  ]]></test>
+</collection>