Enhanced xmlXPathRunStreamEval, fixed handling of depth/level for cases

* xpath.c, pattern.c: Enhanced xmlXPathRunStreamEval, fixed
  handling of depth/level for cases like union operator
  (bug #306348 reported by Bob Stayton).  Also enhanced
  several comments throughout pattern.c.
* doc/apibuild.py: fixed problem in handling of
  'signed' declaration.  Rebuilt the docs.
diff --git a/doc/APIchunk11.html b/doc/APIchunk11.html
index 510648f..89d4ef1 100644
--- a/doc/APIchunk11.html
+++ b/doc/APIchunk11.html
@@ -362,6 +362,7 @@
 <a href="html/libxml-dict.html#xmlDictCreateSub">xmlDictCreateSub</a><br />
 <a href="html/libxml-dict.html#xmlDictReference">xmlDictReference</a><br />
 <a href="html/libxml-hash.html#xmlHashCreateDict">xmlHashCreateDict</a><br />
+<a href="html/libxml-pattern.html#xmlPatterncompile">xmlPatterncompile</a><br />
 <a href="html/libxml-pattern.html#xmlStreamPush">xmlStreamPush</a><br />
 <a href="html/libxml-pattern.html#xmlStreamPushAttr">xmlStreamPushAttr</a><br />
 </dd><dt>dictionnary</dt><dd><a href="html/libxml-parser.html#_xmlParserCtxt">_xmlParserCtxt</a><br />
@@ -375,9 +376,6 @@
 <a href="html/libxml-dict.html#xmlDictQLookup">xmlDictQLookup</a><br />
 <a href="html/libxml-dict.html#xmlDictReference">xmlDictReference</a><br />
 <a href="html/libxml-dict.html#xmlDictSize">xmlDictSize</a><br />
-<a href="html/libxml-pattern.html#xmlPatterncompile">xmlPatterncompile</a><br />
-<a href="html/libxml-pattern.html#xmlStreamPush">xmlStreamPush</a><br />
-<a href="html/libxml-pattern.html#xmlStreamPushAttr">xmlStreamPushAttr</a><br />
 </dd><dt>did</dt><dd><a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_BLOCK_DEFAULT">XML_SCHEMAS_TYPE_BLOCK_DEFAULT</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderGetRemainder">xmlTextReaderGetRemainder</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderStandalone">xmlTextReaderStandalone</a><br />