Port nothing-to-install and install4 test#2965

floitsch wants to merge 13 commits intofloitsch/pkg.99.100.missing-spectoitlang/toit:floitsch/pkg.99.100.missing-specfrom

floitsch/pkg.99.110.install3_4_recomputetoitlang/toit:floitsch/pkg.99.110.install3_4_recomputeCopy head branch name to clipboard