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/libmimify.tex b/Doc/lib/libmimify.tex
index 171e7d2..2982755 100644
--- a/Doc/lib/libmimify.tex
+++ b/Doc/lib/libmimify.tex
@@ -1,6 +1,6 @@
\section{Standard Module \sectcode{mimify}}
\stmodindex{mimify}
-\renewcommand{\indexsubitem}{(in module mimify)}
+\setindexsubitem{(in module mimify)}
The mimify module defines two functions to convert mail messages to
and from MIME format. The mail message can be either a simple message