* WIP. Typos and logging.
* Format todos
* Pause pruning while a snapshot is under way
Logs, docs and todos
* Allocate memory for the full chunk
* Name snapshotting threads
* Ensure `taking_snapshot` is set to false whenever and however `take_snapshot`returns
Rename `take_at` to `request_snapshot_at`
Cleanup
* Let "in_progress" deletion fail
Fix tests
* Just use an atomic
* Review grumbles
* Finish the sentence
* Resolve a few todos and clarify comments.
* Calculate progress rate since last update
* Lockfile
* Fix tests
* typo
* Reinstate default snapshotting frequency
Cut down on the logging noise
* address grumble
* Log memory use with `journal_size()` and explain why.
* Move snapshot to own crate
Sort out imports
* WIP cargo toml
* Make snapshotting generic over the client
Sort out tests
* Sort out types from blockchain and client
* Sort out sync
* Sort out imports and generics
* Sort out main binary
* Fix sync test-helpers
* Sort out import for secret-store
* Sort out more imports
* Fix easy todos
* cleanup
* Move SnapshotClient and SnapshotWriter to their proper places
Sort out the circular dependency between snapshot and ethcore by moving all snapshot tests to own crate, snapshot-tests
* cleanup
* Cleanup
* fix merge issues
* Update ethcore/snapshot/snapshot-tests/Cargo.toml
Co-Authored-By: Andronik Ordian <write@reusable.software>
* Sort out botched merge
* Ensure snapshot-tests run
* Docs
* Fix grumbles
