Makefile checks out checktestdata submodule if needed
Makefile checks out checktestdata submodule if needed

jbransen/problemtools,Kattis/problemtools,jsannemo/problemtools,ghamerly/problemtools,jbransen/problemtools,Kattis/problemtools,ghamerly/problemtools,ghamerly/problemtools,jsannemo/problemtools,godmar/problemtools,jbransen/problemtools,Kattis/problemtools,Kattis/problemtools,ghamerly/problemtools,godmar/problemtools,godmar/problemtools,jsannemo/problemtools,jbransen/problemtools,jsannemo/problemtools,godmar/problemtools