updated properties for scala.concurrent.ExecutionContext.Implicits.global (future task farm), similar to Isabelle/ML;
removed obsolete properties for old actors;
src/Pure
src/FOL
src/HOL
src/ZF
src/CCL
src/CTT
src/Cube
src/FOLP
src/LCF
src/Sequents
src/Doc
src/Tools