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/libquopri.tex b/Doc/lib/libquopri.tex
index d1cb297..4ad0c0f 100644
--- a/Doc/lib/libquopri.tex
+++ b/Doc/lib/libquopri.tex
@@ -11,7 +11,7 @@
 \indexii{quoted printable}{encoding}
 \index{MIME!quoted-printable encoding}
 
-\renewcommand{\indexsubitem}{(in module quopri)}
+\setindexsubitem{(in module quopri)}
 
 \begin{funcdesc}{decode}{input\, output}
 Decode the contents of the \var{input} file and write the resulting