updated csdp-6.1: Linux and Windows executables are as before, but macOS has been rebuilt for x86_64 (to accommodate Catalina);
NOTE: current version 6.2.0 caused odd problems with parallel invocations (e.g. on Ubuntu 18.04);
#main components for everyday use, without big impact on overall build time
bash_process-1.2.3
bib2xhtml-20190409
csdp-6.1
cvc4-1.5-5
e-2.0-2
isabelle_fonts-20190717
jdk-11.0.4+11
jedit_build-20190717
jfreechart-1.5.0
jortho-1.0-2
kodkodi-1.5.2-1
nunchaku-0.5
opam-2.0.3-1
polyml-5.8.1-20191124
postgresql-42.2.5
scala-2.12.10
smbc-0.4.1
spass-3.8ds-1
sqlite-jdbc-3.27.2.1
ssh-java-20190323
stack-1.9.3
vampire-4.2.2
xz-java-1.8
z3-4.4.0pre-3