put "foldl" and "foldr" in "Useful";
Isabelle hides those symbols from List, but by adding them to Useful we have them throughout Metis without "List." prefix
# rsync server configuration
uid = nobody
gid = nobody
use chroot = yes
log file = /tmp/rsyncd.log
read only = true
[isabelle-website]
path = /home/proj/isabelle/website
comment = Isabelle website
[isabelle-distribution]
path = /home/proj/isabelle/website/dist
comment = Isabelle distribution
# Sydney legacy link
[isabelle-dist]
path = /home/proj/isabelle/website
comment = Isabelle website