Use pickle protocol 2.

This way, pickling gets %50 faster and takes %5 less space, unpickling gets about %30 faster

pisi/__init__.py

@@ -12,9 +12,9 @@
 
 # PiSi version
 
-__version__ = "1.1"
+__version__ = "1.1_20070305"
 
-__dbversion__ = "1.1_rc7"
+__dbversion__ = "1.1_20070305"
 __filesdbversion__ = "1.0.5"         # yes, this is the real bottleneck
 
 __all__ = [ 'api', 'config', 'packagedb', 'installdb', 'search' ]

pisi/dbshelve.py

@@ -95,7 +95,7 @@ class DBShelf:
             raise CodingError()
 
     def encode(self, obj):
-        return cPickle.dumps(obj, 1)
+        return cPickle.dumps(obj, 2)
 
     def clear(self, txn = None):
         def proc(txn):