* WN: eliminate "handle _ => ..." (essential for PIDE interaction):

    - either use \<^try>CARTOUCHE / \<^can>CARTOUCHE antiquotation

    - or more basic try/can combinators;

    - or more direct ML of intention;

* WN: check remaining "for tests only" wrt. \<^isac_test>CARTOUCHE;

* WN: eliminate odd notation term tricks: replace "^^^" e.g. by "\<up>"

  based on "_ powr _" for type real;

    abbreviation real_powr :: "real \<Rightarrow> real \<Rightarrow> real"  (infixr "\<up>" 80)

      where "x \<up> a \<equiv> x powr a"

* WN: purge BridgeLibisabelle: eliminate unused code;

* reconsider use of Thy_Info.get_theory: only works with batch-build, not within PIDE session;

* MW: check JVM resource requirements of session Isac_Test;

* MW: check uses of Unsynchronized.ref vs. Synchronized.var;

* MW: proper formal name space for rule set, model patterns, methods;

  proper setup command;

* MW: clarify/eliminate Isabelle/Scala add-ons (presently unused)

    diff -r /home/makarius/isabelle/repos-Isabelle2021/src/Pure/build-jars ./src/Pure/build-jars

    11a12

    >   src/Tools/isac/BridgeJEdit/isac.scala

    diff -r /home/makarius/isabelle/repos-Isabelle2021/src/Pure/Tools/scala_project.scala ./src/Pure/Tools/scala_project.scala

    76a77

    >       "src/Tools/isac/etc" -> Path.explode("isabelle.isac"),

* more direct logical foundations wrt. Isabelle/HOL, eliminate many axiomatizations;

* WN: eliminate ThmC.numerals_to_Free, use existing Isabelle/HOL representation;