Fix#362 by replacing non-deterministic hashed indexes with ordered
indexes
Remove HARDFORK check for witness ordering because this #362 will
require a test net reset to effeciently implment.
Changed the order in wich process_fees iterates accounts to be "by_name"
rather than "by_id" so that we retain the ability to switch back to
hashed indexes in the future.
This change was overly pestimistic and assumes all indexes may be
traversed as part of consensus. We want to reserve the ability to
change some of the indices back to hashed indicies in the future after a
through audit reveals that they are never iterated over in order.
