ROOTS

clarified name context for abstractions -- in contrast to 367e60d9aa1b and Term.variant_frees (*as they are printed :-*);

src/Pure
src/FOL
src/HOL
src/ZF
src/CCL
src/CTT
src/Cube
src/FOLP
src/LCF
src/Sequents
src/Doc
src/Tools