Normalize tabs to spaces.

Update the attribution for the "Curses Programming with Python" How-To.

Change the way the reference to the Demo/curses/ directory is marked up.

Doc/lib/libcurses.tex

@@ -33,9 +33,11 @@ open-source curses library hosted on Linux and the BSD variants of
                              application entry and exit.}
   \seetitle[http://www.python.org/doc/howto/curses/curses.html]{Curses
             Programming with Python}{Tutorial material on using curses
-            with Python, by Andrew Kuchling, is available on the
-            Python Web site.}
-   \seetitle[Demo/curses]{}{Some example programs.}
+            with Python, by Andrew Kuchling and Eric Raymond, is
+            available on the Python Web site.}
+  \seetext{The \file{Demo/curses/} directory in the Python source
+           distribution contains some example programs using the
+           curses bindings provided by this module.}
 \end{seealso}