bytes pins of bash transformers cannot be set inline

[sjdv1982]

tf.foo = ... will not work if foo is a pin of celltype bytes . ( tf.foo = ctx.foo does work correctly) This makes sense since bytes pin checksums are now bypassed from the inp checksum and fed directly into the transformer. Solution: expand the checksum dict to include bytes pin checksums. Nasty: changing the celltype to/from bytes should destroy the existing checksum.