Merge branch 'master' into fix-data-races

cmd/geth/main.go

cmd/geth/usage.go

cmd/pics/state.go

cmd/utils/flags.go

common/dbutils/helper.go

core/blockchain.go

core/chain_indexer_test.go

core/state/repair.go

core/types/derive_sha.go

core/types/derive_sha_test.go

docs/programmers_guide/guide.md

eth/backend.go

eth/config.go

ethdb/badger_db.go

ethdb/bolt_db.go

ethdb/database_test.go

ethdb/interface.go

ethdb/memory_database.go

ethdb/mutation.go

go.mod