Having "addcongs [if_weak_cong]" in analz_image_..._ss makes simplification
faster
\begin{theindex}
\item {\tt doc} tool, 8
\item {\tt DVI_VIEWER} setting, 4
\indexspace
\item {\tt expandshort} tool, 8
\indexspace
\item {\tt findlogics} tool, 9
\item {\tt finish_html}, \bold{16}
\indexspace
\item {\tt getenv} tool, 9
\indexspace
\item HTML, 11, \bold{15}
\indexspace
\item {\tt init_html}, \bold{16}
\item {\tt INSTALL}, 1
\item {\tt installfonts} tool, 12
\item {\tt ISABELLE} setting, 3
\item {\tt Isabelle}, 1, 6
\item {\tt isabelle}, 1, 4
\item {\tt ISABELLE_DOCS} setting, 4
\item {\tt ISABELLE_HOME} setting, 2, 3
\item {\tt ISABELLE_HOME_USER} setting, 3
\item {\tt ISABELLE_INSTALL_FONTS} setting, 4
\item {\tt ISABELLE_INSTALLFONTS} setting, 12
\item {\tt ISABELLE_INTERFACE} setting, 4, 6
\item {\tt ISABELLE_LOGIC} setting, 4
\item {\tt ISABELLE_OUTPUT} setting, 3, 4
\item {\tt ISABELLE_PATH} setting, 3
\item {\tt ISABELLE_TOOLS} setting, 4
\item {\tt ISABELLE_USEDIR_OPTIONS} setting, 4, 11
\item {\tt IsaMakefile}, 10, 11
\item {\tt ISATOOL} setting, 3
\item {\tt isatool}, 1, 6
\indexspace
\item {\tt make} tool, 10
\item {\tt make_html}, \bold{16}
\item {\tt ML_HOME} setting, 3
\item {\tt ML_OPTIONS} setting, 3
\item {\tt ML_SYSTEM} setting, 3
\indexspace
\item settings, \bold{1}
\item {\tt symbolinput} tool, 13
\item {\tt symbols}, 12
\indexspace
\item {\tt use_dir}, 11, 16, 17
\item {\tt usedir} tool, 10
\end{theindex}