Misc: long lists, DRY 2/3 grammars, '%' count

parse{2,3,r}.py: DRY Python expressions between Python 2 and 3
pysource.py, fragment.py, parser.py: handle long lists by grouping in chunks of 32
and 256
bin/uncompyle6: count %s properly

bin/uncompyle6

@@ -47,7 +47,7 @@ Extensions of generated files:
   '.pyc_dis' '.pyo_dis'   successfully decompiled (and verified if --verify)
     + '_unverified'       successfully decompile but --verify failed
     + '_failed'           decompile failed (contact author for enhancement)
-""" % ((program,) * 6
+""" % ((program,) * 5)
 
 program =  os.path.basename(__file__)