interactive runner: increase size of pipes to 1 MB (see #113)
interactive runner: increase size of pipes to 1 MB (see #113)

Kattis/problemtools,jsannemo/problemtools,Kattis/problemtools,jsannemo/problemtools,jsannemo/problemtools,ghamerly/problemtools,ghamerly/problemtools,Kattis/problemtools,Kattis/problemtools,jsannemo/problemtools,ghamerly/problemtools,ghamerly/problemtools