* lib2.tex (sys): updated sys.std{in,out,err} docs. Added

sys.tracebacklimit.
* tut.tex (Exceptions): change text printed by traceback.
* lib5.tex (audioop): added minmax.
* lib5.tex (audioop.getsample): move wandered paragraph back
* lib3.tex, partparse.py: undo mucking with \nopagebreak (didn't work).
* partparse.py: ignore \nopagebreak command
* ref5.tex: added description of lambda forms.
* ref7.tex: added reference to lambda forms to section on function
  definition.
* lib1.tex: removed lambda as built-in function (it is now a special
  form).  Also removed feature of filter, map, reduce to turn a string
  argument into an anonymous function.

Doc/ref/ref7.tex

@@ -292,6 +292,10 @@ parameters) are bound to the (formal) parameters, as follows:
 \indexii{parameter}{formal}
 \indexii{parameter}{actual}
 
+It is also possible to create anonymous functions (functions not bound
+to a name), for immediate use in expressions.  This uses lambda forms,
+described in section \ref{lambda}.
+
 \begin{itemize}
 
 \item