added io1.c an example ox xmlIO usage and io1.res test result, fixed a

* doc/examples/*: added io1.c an example ox xmlIO usage and io1.res
  test result, fixed a awful lot of memory leaks showing up in
  testWriter.c, changed the examples and the Makefiles to test
  memory leaks.
* xmlwriter.c: fixed a memory leak
* Makefile.am: run the doc/examples regression tests as part of
  make tests
* xpath.c include/libxml/xpath.h: added xmlXPathCtxtCompile() to
  compile an XPath expression within a context, currently the goal
  is to be able to reuse the XSLT stylesheet dictionnary, but this
  opens the door to others possible optimizations.
* dict.c include/libxml/dict.h: added xmlDictCreateSub() which allows
  to build a new dictionnary based on another read-only dictionnary.
  This is needed for XSLT to keep the stylesheet dictionnary read-only
  while being able to reuse the strings for the transformation
  dictionnary.
* xinclude.c: fixed a dictionnar reference counting problem occuring
  when document parsing failed.
* testSAX.c: adding option --repeat for timing 100times the parsing
* doc/* : rebuilt all the docs
Daniel
diff --git a/Makefile.am b/Makefile.am
index 9075bfc..451f4ad 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -124,6 +124,7 @@
 
 tests: XMLtests XMLenttests NStests @READER_TEST@ @TEST_SAX@ @TEST_PUSH@ @TEST_HTML@ @TEST_PHTML@  @TEST_VALID@ URItests @TEST_XPATH@ @TEST_XPTR@ @TEST_XINCLUDE@ @TEST_C14N@ @TEST_DEBUG@ @TEST_CATALOG@ @TEST_REGEXPS@ @TEST_SCHEMAS@ @TEST_THREADS@ Timingtests @TEST_VTIME@
 	@(if [ "@PYTHON_SUBDIR@" != "" ] ; then cd python ; $(MAKE) tests ; fi)
+	@(cd doc/examples ; $(MAKE) tests)
 
 valgrind:
 	@echo '## Running the regression tests under Valgrind'