added htmlgen to docs

doc/lib.txt

@@ -255,6 +255,10 @@ XML Processing
 * `htmlparser <htmlparser.html>`_
   This module parses an HTML document and creates its XML tree representation.
 
+* `htmlgen <htmlgen.html>`_
+  This module implements a simple XML and HTML code 
+  generator. Each commonly used HTML tag has a corresponding macro
+  that generates a string with its HTML representation.
 
 Cryptography and Hashing
 ------------------------

web/news.txt

@@ -17,6 +17,7 @@ Bugfixes
 Library Additions
 -----------------
 
+- Added the (already existing) module ``htmlgen`` to the documentation.
 - Added ``system.shallow`` that can be used to speed up string and sequence
   assignments.
 - Added ``system.eval`` that can execute an anonymous block of code at