saveImage, blank, and rect/fillRect
disable tests in student code
Top-level build.sbt.
to test test suite without uploading to PPA
More robust scala220 script
Tests disabled using envvar
Bugfix to scala220
Flag to disable JavaFX
Simpler and more robust exit procedure.
fixed names for fat JARs
bugfix to last commit
Cleanup to support-code
tweaks
tweaks
exclude scala lib