Remove use of framework in the module.

Based on conversation with Evan yesterday, I think this is safe.

src/BTrees/tests/testBTrees.py

@@ -84,7 +84,6 @@
 ##############################################################################
 import sys, os, time, random
 import os, sys
-execfile(os.path.join(sys.path[0], 'framework.py'))
 
 from BTrees.OOBTree import OOBTree, OOBucket, OOSet, OOTreeSet
 from BTrees.IOBTree import IOBTree, IOBucket, IOSet, IOTreeSet
@@ -820,4 +819,3 @@ def lsubtract(l1, l2):
 def realseq(itemsob):
     return map(lambda x: x, itemsob)
 
-framework()