ROOTS

support symbol \<Parallel>, based on \bigparallel from stdmaryd (stmary10.pfb: move y=1100, scale 222%, embolden by 40 units, adjust spacing);

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