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);
syntax: glob
*~
*.class
*.jar
*.marks
*.orig
*.rej
.DS_Store
.swp
syntax: regexp
^contrib
^heaps/
^browser_info/
^doc/.*\.pdf
^src/Tools/jEdit/dist/
^src/Tools/VSCode/out/
^src/Tools/VSCode/extension/node_modules/
^Admin/jenkins/ci-extras/target/