prepare for release work for #303289, fix a formatting bug for MIN_INT

* configure.in doc/* configure.in: prepare for release
* xpath.c: work for #303289, fix a formatting bug for MIN_INT
Daniel
diff --git a/doc/xml.html b/doc/xml.html
index b02d144..90d28a3 100644
--- a/doc/xml.html
+++ b/doc/xml.html
@@ -716,6 +716,45 @@
 
 <p>There is the list of public releases:</p>
 
+<h3>2.6.21: Sep 4 2005</h3>
+<ul>
+  <li>build fixes: Cygwin portability fixes (Gerrit P. Haase), calling
+      convention problems on Windows (Marcus Boerger), cleanups based on
+      Linus' sparse tool, update of win32/configure.js (Rob Richards),
+      remove warnings on Windows(Marcus Boerger), compilation without SAX1,
+      detection of the Python binary, use $GCC inestad of $CC = 'gcc' (Andrew
+      W. Nosenko), compilation/link with threads and old gcc, compile
+      problem by C370 on Z/OS, </li>
+  <li>bug fixes: http_proxy environments (Peter Breitenlohner), HTML UTF-8
+      bug (Jiri Netolicky), XPath NaN compare bug (William Brack), 
+      htmlParseScript potential bug, Schemas regexp handling of spaces,
+      Base64 Schemas comparisons NIST passes, automata build error xsd:all,
+      xmlGetNodePath for namespaced attributes (Alexander Pohoyda),
+      xmlSchemas foreign namespaces handling, XML Schemas facet comparison
+      (Kupriyanov Anatolij), xmlSchemaPSimpleTypeErr error report (Kasimier
+      Buchcik), xml: namespace ahndling in Schemas (Kasimier), empty model
+      group in Schemas (Kasimier), wilcard in Schemas (Kasimier), URI 
+      composition (William), xs:anyType in Schemas (Kasimier), Python resolver
+      emmitting error messages directly, Python xmlAttr.parent (Jakub Piotr
+      Clapa), trying to fix the file path/URI conversion, 
+      xmlTextReaderGetAttribute fix (Rob Richards), xmlSchemaFreeAnnot memleak
+      (Kasimier), HTML UTF-8 serialization, streaming XPath, Schemas determinism
+      detection problem, XInclude bug, Schemas context type (Dean Hill),
+      validation fix (Derek Poon), xmlTextReaderGetAttribute[Ns] namespaces
+      (Rob Richards), Schemas type fix (Kuba Nowakowski), UTF-8 parser bug,
+      error in encoding handling, xmlGetLineNo fixes, bug on entities handling,
+      entity name extraction in error handling with XInclude, text nodes
+      in HTML body tags (Gary Coady), xml:id and IDness at the treee level
+      fixes, XPath streaming patterns bugs.</li>
+  <li>improvements: structured interfaces for schemas and RNG error reports
+      (Marcus Boerger), optimization of the char data inner loop parsing
+      (thanks to Behdad Esfahbod for the idea), schematron validation
+      though not finished yet, xmlSaveOption to omit XML declaration,
+      keyref match error reports (Kasimier), formal expression handling
+      code not plugged yet, more lax mode for the HTML parser, 
+      parser XML_PARSE_COMPACT option for text nodes allocation.</li>
+  <li>documentation: xmllint man page had --nonet duplicated</li>
+</ul>
 <h3>2.6.20: Jul 10 2005</h3>
 <ul>
   <li> build fixes: Windows build (Rob Richards), Mingw compilation (Igor