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/StackViewer.py

@@ -1,6 +1,5 @@
 import os
 import sys
-import string
 import linecache
 
 from TreeWidget import TreeNode, TreeItem, ScrolledCanvas
@@ -50,7 +49,7 @@ class FrameTreeItem(TreeItem):
         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: