Persist reset fix

[localhuman]

What current issue(s) does this address, or what feature is it adding?

• Balance mismatches in neo/gas were being caused by the resetting of storages during failed smart contract invocations.

How did you solve this problem?

• DBCollection now has a method MarkForReset which caches a change-set that can be reverted back to in the case of a failed smart contract invocation.

How did you make sure your solution works?

• Manually verify balances that were previously incorrect

Are there any special changes in the code that we should be aware of?

• Currently re-syncing mainnet Chain and Notification databases, will add another PR once those are complete.

Please check the following, if applicable:

• Did you add any tests?
• Did you run make lint?
• Did you run make test?
• Are you making a PR to a feature branch or development rather than master?
• Did you add an entry to CHANGELOG.rst? (if not, please do)

[coveralls]

Coverage increased (+0.02%) to 80.25% when pulling 0cc9c03 on persist-reset-fix into cfc8361 on development.

[jseagrave21]

@localhuman This looks great! It looks like it should address #578 but will it also fix the issues I am seeing in #605 ?

[localhuman]

Not sure about #605. I frequently use wallets with multiple addresses and have not seen that behavior.