Apply diff2.txt from SF patch http://www.python.org/sf/572113

(with one small bugfix in bgen/bgen/scantools.py)

This replaces string module functions with string methods
for the stuff in the Tools directory. Several uses of
string.letters etc. are still remaining.

Tools/idle/OldStackViewer.py

@@ -1,4 +1,3 @@
-import string
 import sys
 import os
 from Tkinter import *
@@ -121,7 +120,7 @@ def load_stack(self, stack, index=None):
             filename = code.co_filename
             funcname = code.co_name
             sourceline = linecache.getline(filename, lineno)
-            sourceline = string.strip(sourceline)
+            sourceline = sourceline.strip()
             if funcname in ("?", "", None):
                 item = "%s, line %d: %s" % (modname, lineno, sourceline)
             else: