bunch more __all__ lists
also modified check_all function to suppress all warnings since they aren't
relevant to what this test is doing (allows quiet checking of regsub, for
instance)
diff --git a/Lib/rexec.py b/Lib/rexec.py
index 57ea599..6a7c207 100644
--- a/Lib/rexec.py
+++ b/Lib/rexec.py
@@ -23,6 +23,7 @@
 import os
 import ihooks
 
+__all__ = ["RExec"]
 
 class FileBase: