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.)
diff --git a/Lib/test/test_rgbimg.py b/Lib/test/test_rgbimg.py
index 650c02a..65a0f42 100644
--- a/Lib/test/test_rgbimg.py
+++ b/Lib/test/test_rgbimg.py
@@ -14,7 +14,7 @@
 class error(Exception):
     pass
 
-print 'RGBimg test suite:'
+print('RGBimg test suite:')
 
 def testimg(rgb_file, raw_file):
     rgb_file = findfile(rgb_file)
@@ -40,11 +40,11 @@
     source = findfile(source)
     target = findfile(target)
     if verbose:
-        print "uudecoding", source, "->", target, "..."
+        print("uudecoding", source, "->", target, "...")
     uu.decode(source, target)
 
 if verbose:
-    print "testing..."
+    print("testing...")
 
 ttob = rgbimg.ttob(0)
 if ttob != 0: