New objects mostly work, procedure calls are ok, but GC messes things up.
treebd70a2529614e2b87b354233a9cb36941b71c784
-rw-r--r-- 9830 library.scm
-rw-r--r-- 56004 picobit-vm.c
-rw-r--r-- 104775 picobit.scm
-rw-r--r-- 388 red-green.scm
-rw-r--r-- 31589 robot.scm