Remove all \bcode / \ecode cruft; this is no longer needed.  See previous
checkin of myformat.sty.

Change "\renewcommand{\indexsubitem}{(...)}" to "\setindexsubitem{(...)}"
everywhere.

Some other minor nits that I happened to come across.
diff --git a/Doc/lib/libaifc.tex b/Doc/lib/libaifc.tex
index 590f0d4..19af8f3 100644
--- a/Doc/lib/libaifc.tex
+++ b/Doc/lib/libaifc.tex
@@ -23,7 +23,7 @@
 
 Module \code{aifc} defines the following function:
 
-\renewcommand{\indexsubitem}{(in module aifc)}
+\setindexsubitem{(in module aifc)}
 \begin{funcdesc}{open}{file\, mode}
 Open an AIFF or AIFF-C file and return an object instance with
 methods that are described below.  The argument file is either a
@@ -38,7 +38,7 @@
 Objects returned by \code{aifc.open()} when a file is opened for
 reading have the following methods:
 
-\renewcommand{\indexsubitem}{(aifc object method)}
+\setindexsubitem{(aifc object method)}
 \begin{funcdesc}{getnchannels}{}
 Return the number of audio channels (1 for mono, 2 for stereo).
 \end{funcdesc}