Document napms()

Add reference to demo directory

Doc/lib/libcurses.tex

@@ -33,6 +33,7 @@ open-source curses library hosted on Linux and the BSD variants of
             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.}
 \end{seealso}
 
 
@@ -310,6 +311,10 @@ event mask.  If this function is never called, no mouse events are
 ever reported.
 \end{funcdesc}
 
+\begin{funcdesc}{napms}{ms}
+Sleep for \var{ms} milliseconds.
+\end{funcdesc}
+
 \begin{funcdesc}{newpad}{nlines, ncols}
 Creates and returns a pointer to a new pad data structure with the
 given number of lines and columns.  A pad is returned as a