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/libmailcap.tex b/Doc/libmailcap.tex
index b475b11..ecc8369 100644
--- a/Doc/libmailcap.tex
+++ b/Doc/libmailcap.tex
@@ -1,7 +1,7 @@
 \section{Standard Module \sectcode{mailcap}}
 \label{module-mailcap}
 \stmodindex{mailcap}
-\renewcommand{\indexsubitem}{(in module mailcap)}
+\setindexsubitem{(in module mailcap)}
 
 Mailcap files are used to configure how MIME-aware applications such
 as mail readers and Web browsers react to files with different MIME
@@ -69,9 +69,9 @@
 \end{funcdesc}
 
 An example usage:
-\bcode\begin{verbatim}
+\begin{verbatim}
 >>> import mailcap
 >>> d=mailcap.getcaps()
 >>> mailcap.findmatch(d, 'video/mpeg', filename='/tmp/tmp1223')
 ('xmpeg /tmp/tmp1223', {'view': 'xmpeg %s'})
-\end{verbatim}\ecode
+\end{verbatim}