Add --index flag.

Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
Update manpage.

Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
README: Bug report guidelines.

Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
Merge branch 'index'