added Imperative_HOL examples; added tail-recursive combinator for monadic heap functions; adopted code generation of references; added lemmas
# -*- shell-script -*- :mode=shellscript:
#
# Isabelle user settings sample -- for use in ~/.isabelle/etc/settings
ISABELLE_USEDIR_OPTIONS="-i true -d pdf"
HOL_USEDIR_OPTIONS="-p 1"
ISABELLE_LOGIC=HOL