Added tag 0.6.21 for changeset de44acab3cfc

--HG--
branch : distribute
extra : rebase_source : 63dcebb8a273de6b634466ef81dc7912223e34e4

.hgtags

@@ -28,3 +28,4 @@ dae247400d0ca1fdfaf38db275622c9bec550b08 0.6.13
 611910892a0421633d72677979f94a25ef590d54 0.6.19
 a7cf5ae137f1646adf86ce5d6b5d8b7bd6eab69f 0.6.20
 c4a375336d552129aef174486018ed09c212d684 0.6.20
+de44acab3cfce1f5bc811d6c0fa1a88ca0e9533f 0.6.21