* sc-client-db: utils::open_database(...) — return OpenDbError so that the caller could tell the `OpenDbError::DoesNotExist` clearly
* sc-client-db: utils::open_database(..) — accept the `create: bool` argument
* sc-client-db: pruning — optional argument in the DatabaseSettings
* sc-state-db: Split `Error<E>` into separate `Error<E>` and `StateDbError`
* StateDb::open: choose the pruning-mode depending on the requested and stored values
* sc-state-db: test for different combinations of stored and requested pruning-modes
* CLI-argument: mark the unsafe-pruning as deprecated
* Fix tests
* tests: do not specify --pruning when running the substrate over the existing storage
* fix types for benches
* cargo fmt
* Check whether the pruning-mode and sync-mode are compatible
* cargo fmt
* parity-db: 0.3.11 -> 0.3.12
* sc-state-db: MetaDb::set_meta — a better doc-test
* cargo fmt
* make MetaDb read-only again!
* Remove the stray newline (and run the CI once again please)
* Last nitpicks
* A more comprehensive error message
Roman Gafiyatullin