Merged the int/long unification branch, by very crude means (sorry Thomas!).

I banged on the code (beyond what's in that branch) to make fewer tests fail;
the only tests that fail now are:
  test_descr -- can't pickle ints?!
  test_pickletools -- ???
  test_socket -- See python.org/sf/1619659
  test_sqlite -- ???
I'll deal with those later.

Lib/test/test_descr.py

@@ -430,13 +430,6 @@ def ints():
         pass
     else:
         raise TestFailed, "NotImplemented should have caused TypeError"
-    import sys
-    try:
-        C(sys.maxint+1)
-    except OverflowError:
-        pass
-    else:
-        raise TestFailed, "should have raised OverflowError"
 
 def longs():
     if verbose: print "Testing long operations..."