ROOTS

avoid complication and event duplication due to KeyEventInterceptor -- NB: popup has focus within root window, it is closed on loss of focus;
uniform JEdit_Lib.propagate_key;

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