core/state: add handling for DiscardSnapshot
core/state: use new journal
core/state, genesis: fix flaw re discard/commit.
In case the state is committed, the journal is reset, thus it is not correct to Discard/Revert snapshots at that point.
core/state: fix nil defer in merge
core/state: fix bugs in setjournal
core/state: journal api changes
core/state: bugfixes in sparse journal
core/state: journal tests
core/state: improve post-state check in journal-fuzzing test
core/state: post-rebase fixups
miner: remove discard-snapshot call, it's not needed since journal will be reset in Finalize
core/state: fix tests
core/state: lint
core/state: supply origin-value when reverting storage change
Update core/genesis.go
core/state: fix erroneous comments
core/state: review-nits regarding the journal
Martin Holst Swende