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/libgzip.tex b/Doc/libgzip.tex
index f832da7..df99e5d 100644
--- a/Doc/libgzip.tex
+++ b/Doc/libgzip.tex
@@ -12,7 +12,7 @@
 object, though it's not possible to use the \code{seek()} and
 \code{tell()} methods to access the file randomly.
 
-\renewcommand{\indexsubitem}{(in module gzip)}
+\setindexsubitem{(in module gzip)}
 \begin{funcdesc}{open}{fileobj\optional{\, filename\optional{\, mode\, compresslevel}}}
   Returns a new \code{GzipFile} object on top of \var{fileobj}, which
   can be a regular file, a \code{StringIO} object, or any object which