SF bug #494738:  binascii_b2a_base64 overwrites memory.
binascii_b2a_base64():  We didn't allocate enough buffer space for very
short inputs (e.g., a 1-byte input can produce a 5-byte output, but we
only allocated 2 bytes).  I expect that malloc overheads absorbed the
overrun in practice, but computing a correct upper bound is a very simple
change.
diff --git a/Misc/ACKS b/Misc/ACKS
index 1ebf774..3616e57 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -92,6 +92,7 @@
 Jeffery Collins
 Matt Conway
 David M. Cooke
+David Costanzo
 Scott Cotton
 Greg Couch
 Steve Cousins