libxml now grok Docbook-3.1.5 and Docbook-4.1.1 DTDs, this

popped out a couple of bugs and 3 speed issues, there is only
on minor speed issue left. Assorted collection of user reported
bugs and fixes:
- doc/encoding.html: added encoding aliases doc
- doc/xml.html: updates
- encoding.[ch]: added EncodingAliases functions
- entities.[ch] valid.[ch] debugXML.c: removed two serious
  bottleneck affecting large DTDs like Docbook
- parser.[ch] xmllint.c: added a pedantic option, will be useful
- SAX.c: redefinition of entities is reported in pedantic mode
- testHTML.c: uninitialized warning from gcc
- uri.c: fixed a couple of bugs
- TODO: added issue raised by Michael
Daniel

include/libxml/parserInternals.h

@@ -431,6 +431,12 @@ extern "C" {
 #define MOVETO_STARTTAG(p)						\
     while ((*p) && (*(p) != '<')) (p)++
 
+/**
+ * Not for the faint of heart
+ */
+
+extern int xmlParserDebugEntities;
+
 /**
  * Parser context
  */