- specify what should be packaged by default

- note the zpkg command line that should be used
- remove Persistence from the resource map
- remove SETUP.cfg now that it is not needed

SETUP.cfg

-# unfortunate turd

zpkg.conf

@@ -2,9 +2,12 @@
 #
 # To getnerate a ZODB release, use:
 #
+#     zpkg -C zpkg.conf -v <version>
+#
 
 build-application     no
 collect-dependencies  yes
+default-collection    ZODB3
 
 <resources>
   # This is the ZODB3 release package:
@@ -14,7 +17,6 @@ collect-dependencies  yes
   # This group is maintained as part of the ZODB project:
   #
   BTrees          src/BTrees
-  Persistence     src/Persistence
   persistent      src/persistent
   transaction     src/transaction
   ThreadedAsync   src/ThreadedAsync