started work needed to generate devhelp content, not too hard based on the

* configure.in doc/Makefile.am doc/apibuild.py doc/libxml2-api.xml
  doc/devhelp/*: started work needed to generate devhelp content,
  not too hard based on the existing format and extractor.
Daniel
diff --git a/configure.in b/configure.in
index ad902eb..93e3850 100644
--- a/configure.in
+++ b/configure.in
@@ -1317,6 +1317,6 @@
 ln -s Copyright COPYING
 
 # keep on one line for cygwin c.f. #130896
-AC_OUTPUT(libxml2.spec:libxml.spec.in Makefile include/Makefile include/libxml/Makefile doc/Makefile doc/examples/Makefile example/Makefile python/Makefile python/tests/Makefile xstc/Makefile include/libxml/xmlversion.h xml2-config libxml-2.0.pc libxml-2.0-uninstalled.pc python/setup.py)
+AC_OUTPUT(libxml2.spec:libxml.spec.in Makefile include/Makefile include/libxml/Makefile doc/Makefile doc/examples/Makefile doc/devhelp/Makefile example/Makefile python/Makefile python/tests/Makefile xstc/Makefile include/libxml/xmlversion.h xml2-config libxml-2.0.pc libxml-2.0-uninstalled.pc python/setup.py)
 
 chmod +x xml2-config python/setup.py