Whitespace normalization, plus:

+ test_quopri.py relied on significant trailing spaces.  Fixed.
+ test_dircache.py (still) doesn't work on Windows (directory mtime on
  Windows doesn't work like it does on Unix).

Lib/test/test_quopri.py

@@ -25,8 +25,8 @@ characters... have fun!
 """
 
 # First line ends with a space
-DECSAMPLE = """\
-Here's a bunch of special 
+DECSAMPLE = "Here's a bunch of special \n" + \
+"""\