* Get rid of redundant arity field from op defs. Reorder and renumber ops. Fix bb_end for abort and exit.
* FATE does not accept arbitrary stack positions, only the accumulator aka stack 0.
* Change names of generated aeb_fate_code -> aeb_fate_ops
* Break out fate code to separate adt module
* Fix documentation of the SPEND op
* More compact implementation of serialization/deserialization
* Changed argument specification order