Mirabelle tool script conforming to standard Isabelle tool interface,
tidied Perl script,
moved ML sources to Tools subdirectory
MIRABELLE_HOME="$COMPONENT"
MIRABELLE_LOGIC=HOL
MIRABELLE_OUTPUT_PATH=/tmp/mirabelle
MIRABELLE_TIMEOUT=30
MIRABELLE_VERBOSE=false
ISABELLE_TOOLS="$ISABELLE_TOOLS:$MIRABELLE_HOME/lib/Tools"