- validate output and commitment in tuple conversion function
- function to get_unlock_height from height in chain + unlock_time
- tx_outs_to_leaf_tuples function
- cleaned up trim impl (reduced num params in instructions and
conditional complexity)
- renamed locked_outputs table to locked_leaves (clearer tie to
merkle tree)
- size_t -> uint64_t for db compatibility across 32-bit and 64-bit
machines
- added hash_grow tests
