Fix most trivially-findable print statements.

There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.

(Oh, and I don't know if the compiler package works.)

Lib/unittest.py

@@ -759,8 +759,8 @@ Examples:
         self.runTests()
 
     def usageExit(self, msg=None):
-        if msg: print msg
-        print self.USAGE % self.__dict__
+        if msg: print(msg)
+        print(self.USAGE % self.__dict__)
         sys.exit(2)
 
     def parseArgs(self, argv):