Added section for operator module (compiled Skip Montanaro).

Doc/lib/lib.tex

@@ -77,6 +77,7 @@ to Python and how to embed it in other applications.
 \input{libpython}		% Python Services
 \input{libsys}
 \input{libtypes2}		% types is already taken :-(
+\input{liboperator}
 \input{libtraceback}
 \input{libpickle}
 \input{libshelve}