[enh] #80 add revert block feature

Cargo.lock

Cargo.toml

blockchain/apply_valid_block.rs

blockchain/check_and_apply_block.rs

blockchain/clippy.toml

blockchain/dbex.rs

blockchain/lib.rs

blockchain/revert_block.rs

blockchain/sync.rs

core/cli/en.yml

core/lib.rs

dal/identity.rs

dal/lib.rs

dal/sources.rs

dal/writers/block.rs

dal/writers/dividend.rs

dal/writers/identity.rs

dal/writers/requests.rs

dal/writers/transaction.rs

documents/blockchain/v10/documents/block.rs