* Add credit-only flag to AccountMeta, default to false
* Sort keys by is_credit_only within signed/unsigned groupings
* Process and de-dupe program keys along with other account keys
* Add message helper functions
* Fix test
* Improve comment
* s/is_credit_only/is_debitable
* Add InstructionKeys helper struct, and simplify program_position method
* Add num_readonly_accounts slice
* Impl programs in account_keys
* Emulate current account-loading functionality using program-account_keys (breaks exchange_program_api tests)
* Fix test
* Add temporary exchange faucet id
* Update chacha golden
* Split num_credit_only_accounts into separate fields
* Improve readability
* Move message field constants into Message
* Add MessageHeader struct and fixup comments
* Remove unused PohServiceConfig::Step
* Clarify variable name
* Poh::hash() now takes an iteration counter
* man -> max
* Inline functions with single call site
* Move PohServiceConfig into GenesisBlock
* Add plumbing to enable real PoH on testnets
* Batch hashes to improve PoH hash rate
* Ensure a constant hashes_per_tick
* Remove PohEntry mixin field
* Poh/PohEntry no longer maintains tick_height
* Ensure a constant hashes_per_tick
* ci/localnet-sanity.sh: Use real PoH
* Rework Poh/PohService to keep PohRecorder unlocked as much as possible while hashing
* Revert "Revert "Migrate from ring to ed25519-dalek, take 2 (#3844)" (#3868)"
This reverts commit 6a878602f2a531e087d07fbf5cbeed02431567ca.
* Fix Signature::verify method
* Migrate from ring to ed25519-dalek
* Move gen_keypair_file test to a more appropriate location
* Fixup bench-exchange and add helper fn for single deterministic keypair
* Update golden
* Refactor Storage Program
* Replace KeyedAccount trait with StorageAccount struct
* Implement State for Account, not StorageAccount
* Make State trait more generic
* Move validation check into function
Added CompiledInstruction::program_id() so that we don't need to pass
around instruction indexes just for Message::program_id().
Also added Message.program_ids() that returns a slice so that we
can move those pubkeys into Message::account_keys.
