added support for HTML PIs #156087 added specific tests Daniel

* HTMLparser.c: added support for HTML PIs #156087
* test/HTML/python.html result/HTML/python.html*: added specific tests
Daniel
diff --git a/SAX2.c b/SAX2.c
index c41af00..ddb13e9 100644
--- a/SAX2.c
+++ b/SAX2.c
@@ -2635,7 +2635,7 @@
     hdlr->characters = xmlSAX2Characters;
     hdlr->cdataBlock = xmlSAX2CDataBlock;
     hdlr->ignorableWhitespace = xmlSAX2IgnorableWhitespace;
-    hdlr->processingInstruction = NULL;
+    hdlr->processingInstruction = xmlSAX2ProcessingInstruction;
     hdlr->comment = xmlSAX2Comment;
     hdlr->warning = xmlParserWarning;
     hdlr->error = xmlParserError;