Various cleanup.
tree5bf99dfdbfeea601f2621f7c7834835d660988c0
-rw-r--r-- 10354 library.scm
-rw-r--r-- 69078 picobit-vm.c
-rw-r--r-- 110894 picobit.scm
-rw-r--r-- 388 red-green.scm
-rw-r--r-- 31589 robot.scm