----- update of isac SYNTAX Isabelle2002 --> Isabelle2009-2 finished.
Semantic check is to be done. Known problems (see #974b):
# hierarchy of theory elements for IsacKnowledge seems empty
(no ouput befor *** insert: not found ... IS OK)
# copynamed ___ --> ''' in Interpreter
# Subproblem (Thy', ... instead of Thy_ in Interpreter
# theory' handled inconsistently: "Thy" | "Thy.thy"
# thm' handled inconsistently: "refl" | "Test.refl" | "Test.class.refl"