add a bonus for chained facts, since they are likely to be relevant;
(especially in a Mirabelle run!) -- chained facts used to be included forcibly, then were treated as any other fact; the current approach seems more flexible
# -*- shell-script -*- :mode=shellscript:
#
# Isabelle user settings sample -- for use in ~/.isabelle/etc/settings
ISABELLE_USEDIR_OPTIONS="-i true -d pdf"
ISABELLE_LOGIC=HOL