clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
# -*- shell-script -*- :mode=shellscript:
MIRABELLE_HOME="$COMPONENT"
MIRABELLE_LOGIC=HOL
MIRABELLE_THEORY=Main
MIRABELLE_TIMEOUT=30
ISABELLE_TOOLS="$ISABELLE_TOOLS:$MIRABELLE_HOME/lib/Tools"