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.sax b/result/cdata2.sax
new file mode 100644
index 0000000..46b025e
--- /dev/null
+++ b/result/cdata2.sax
@@ -0,0 +1,18 @@
+SAX.setDocumentLocator()
+SAX.startDocument()
+SAX.startElement(collection)
+SAX.characters(
+  , 3)
+SAX.startElement(test)
+SAX.pcdata(
+    <![CDATA[abc], 18)
+SAX.characters(], 1)
+SAX.getEntity(gt)
+SAX.characters(>, 1)
+SAX.pcdata(
+  , 3)
+SAX.endElement(test)
+SAX.characters(
+, 1)
+SAX.endElement(collection)
+SAX.endDocument()