New formatting scripts.

The use/defs extraction in runoff still needs some work
for xv6 code style.

runoff.list

@@ -0,0 +1,50 @@
+# basic headers
+types.h
+param.h
+defs.h
+x86.h
+asm.h
+elf.h
+mmu.h
+spinlock.h
+
+# low level startup
+bootasm.S
+bootother.S
+main.c
+init.c
+spinlock.c
+proc.h
+proc.c
+setjmp.S
+kalloc.c
+syscall.h
+trapasm.S
+traps.h
+trap.c
+vectors.pl
+syscall.c
+
+# file system
+buf.h
+dev.h
+fcntl.h
+stat.h
+fd.h
+fs.h
+fsvar.h
+fd.c
+fs.c
+bio.c
+ide.c
+pipe.c
+
+# mp and other "uninteresting" things
+mp.h
+ioapic.h
+mp.c
+lapic.c
+ioapic.c
+picirq.c
+console.c
+string.c