Hand repair of cases where reindent changed lines of the form

\t\t\t\t\treal code
##\t\t\t\t\tunused code
\t\t\t\t\treal code

via untabifying and shifting the real code left.  Semantically the
same but made the intent of the commented-out-in-column-0 unused code
unclear.  The exact same unused code appears to have gotten copied from
file to file over the years.

Tools/scripts/dutree.py

@@ -42,8 +42,8 @@ def show(total, d, prefix):
         tsub, dsub = d[key]
         list.append((tsub, key))
         if tsub is not None: sum = sum + tsub
-##      if sum < total:
-##              list.append((total - sum, os.curdir))
+##  if sum < total:
+##      list.append((total - sum, os.curdir))
     list.sort()
     list.reverse()
     width = len(`list[0][0]`)