moved string and UTF8 routines out of parser.c and encoding.c into a new

* encoding.c, parser.c, xmlstring.c, Makefile.am,
  include/libxml/Makefile.am, include/libxml/catalog.c,
  include/libxml/chvalid.h, include/libxml/encoding.h,
  include/libxml/parser.h, include/libxml/relaxng.h,
  include/libxml/tree.h, include/libxml/xmlwriter.h,
  include/libxml/xmlstring.h:
  moved string and UTF8 routines out of parser.c and encoding.c
  into a new module xmlstring.c with include file
  include/libxml/xmlstring.h mostly using patches from Reid
  Spencer.  Since xmlChar now defined in xmlstring.h, several
  include files needed to have a #include added for safety.
* doc/apibuild.py: added some additional sorting for various
  references displayed in the APIxxx.html files.  Rebuilt the
  docs, and also added new file for xmlstring module.
* configure.in: small addition to help my testing; no effect on
  normal usage.
* doc/search.php: added $_GET[query] so that persistent globals
  can be disabled (for recent versions of PHP)
diff --git a/Makefile.am b/Makefile.am
index d40f253..9075bfc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,7 +24,7 @@
 		parser.c tree.c hash.c list.c xmlIO.c xmlmemory.c uri.c  \
 		valid.c xlink.c HTMLparser.c HTMLtree.c debugXML.c xpath.c  \
 		xpointer.c xinclude.c nanohttp.c nanoftp.c DOCBparser.c \
-		catalog.c globals.c threads.c c14n.c \
+		catalog.c globals.c threads.c c14n.c xmlstring.c \
 		xmlregexp.c xmlschemas.c xmlschemastypes.c xmlunicode.c \
 		triostr.c trio.c xmlreader.c relaxng.c dict.c SAX2.c \
 		xmlwriter.c legacy.c chvalid.c pattern.c
@@ -33,7 +33,7 @@
 		parser.c tree.c hash.c list.c xmlIO.c xmlmemory.c uri.c  \
 		valid.c xlink.c HTMLparser.c HTMLtree.c debugXML.c xpath.c  \
 		xpointer.c xinclude.c nanohttp.c nanoftp.c DOCBparser.c \
-		catalog.c globals.c threads.c c14n.c \
+		catalog.c globals.c threads.c c14n.c xmlstring.c \
 		xmlregexp.c xmlschemas.c xmlschemastypes.c xmlunicode.c \
 		xmlreader.c relaxng.c dict.c SAX2.c \
 		xmlwriter.c legacy.c chvalid.c pattern.c