fixed a typo pointed by Jeroen Ruigrok increased the APIs for xmlReader

* doc/xmllint.1 doc/xmllint.html doc/xmllint.xml: fixed a typo
  pointed by Jeroen Ruigrok
* include/libxml/xmlreader.h include/libxml/xmlschemas.h: increased
  the APIs for xmlReader schemas validation support
* xmllint.c xmlreader.c xmlschemas.c: xmlReader schemas validation
  implementation and testing as xmllint --stream --schema ...
Daniel
diff --git a/doc/xmllint.html b/doc/xmllint.html
index 2bc4174..0a55877 100644
--- a/doc/xmllint.html
+++ b/doc/xmllint.html
@@ -71,7 +71,7 @@
 	    Turn on gzip compression of output.
 	  </dd><dt><span class="term"><tt class="option">--html</tt></span></dt><dd>
 	    Use the <span class="acronym">HTML</span> parser.
-	  </dd><dt><span class="term"><tt class="option">--xmlout</tt></span></dt><dd>Used in conjusntion with <tt class="option">--html</tt>. Usually
+	  </dd><dt><span class="term"><tt class="option">--xmlout</tt></span></dt><dd>Used in conjunction with <tt class="option">--html</tt>. Usually
   when HTML is parsed the document is saved with the HTML serializer, but with
   this option the resulting document is saved with the XML serializer. This is
   primarily used to generate XHTML from HTML input.</dd><dt><span class="term"><tt class="option">--push</tt></span></dt><dd>