code cleanup, especially the function comments. fixed a small bug when

* DOCBparser.c HTMLparser.c c14n.c debugXML.c encoding.c hash.c
  nanoftp.c nanohttp.c parser.c parserInternals.c testC14N.c
  testDocbook.c threads.c tree.c valid.c xmlIO.c xmllint.c xmlmemory.c
  xmlreader.c xmlregexp.c xmlschemas.c xmlschemastypes.c xpath.c:
  code cleanup, especially the function comments.
* tree.c: fixed a small bug when freeing nodes which are XInclude ones.
Daniel

xmlreader.c

@@ -571,7 +571,7 @@ xmlTextReaderNodeType(xmlTextReaderPtr reader) {
 }
 
 /**
- * xmlTextReaderIsEmpty:
+ * xmlTextReaderIsEmptyElement:
  * @reader:  the xmlTextReaderPtr used
  *
  * Check if the current node is empty