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/libjpeg.tex b/Doc/libjpeg.tex
index 0d1dc1c..75691cf 100644
--- a/Doc/libjpeg.tex
+++ b/Doc/libjpeg.tex
@@ -10,7 +10,7 @@
 
 The \code{jpeg} module defines these functions:
 
-\renewcommand{\indexsubitem}{(in module jpeg)}
+\setindexsubitem{(in module jpeg)}
 \begin{funcdesc}{compress}{data\, w\, h\, b}
 Treat data as a pixmap of width \var{w} and height \var{h}, with \var{b} bytes per
 pixel.  The data is in SGI GL order, so the first pixel is in the