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/rfc822.py b/Lib/rfc822.py
index 89de69a..101013d 100644
--- a/Lib/rfc822.py
+++ b/Lib/rfc822.py
@@ -59,6 +59,7 @@
 
 import time
 
+__all__ = ["Message","AddressList","parsedate","parsedate_tz","mktime_tz"]
 
 _blanklines = ('\r\n', '\n')            # Optimization for islast()