Record processed non-implicit transactions into unapplied_transactions during abort_block.

Properly set signed_id in transaction_metadata.

Fix block production in tester (also added ability to make empty blocks).

Also fixed bug in fork_database::prune that could cause memory access violations.

Also, it now checks to ensure the proposed producer schedule would actually change the schedule.

Also update native action handlers to reflect changes in PR #2440.

  - fix bug with notified accounts not being called or added to trace
  - fix updateauth action to move delay into authority structure and
  rename 'data' to 'auth'
  - fix checktime for inline transactions

Make currency contract tables primary keys same as eosio.token.

Removed mindelay action since the `delay_sec` field makes it unnecessary.

Additional unit tests to test the new semantics of delay_sec are needed.

Also, apply_block and push_transaction now respect the skip_authority_check flag.

compress context_free_data in packed_transaction and change bandwidth usage values in transaction header into upper limits

remove testers estimation of cpu usage which was horribly broken by 18009d1e but not detected due to a math error put into the chain_controller.  Also fixed tests whose assumptions were now wrong after the removal of said estimation.  Finally, fixed the dice contract which was expecting empty tables to exist. EOSIO/eos#2042