generalize maildir/complete-folder and change maildir/directory-pair to return names and dirs
move maildir-list so it depends on maildir/completing-folder and it can complete a folder to start
add maildir indicator to filenames in maildir/link
slight improvement to maildir-list interactive form
new indexing tools based on the pipe library
remove spurious functions and make maildir-index-make autoload
depend on the pipe library for maildir-index
take days as an interactive arg to maildir-index-make