If we create a new Lido address then we should change all Lido program derived accounts like reserve account, stake authority and mint authority (which means we should set new mint authority for stSOL)

Batch approve many instructions in a single transaction, usefull when
signing with a ledger

on initialization

Always put account type field first among other account fields

When there is a big amount in a reserve account Solana can't activate
it in a single shot. It activates it in several epochs. When reserve
SOLs are sent to stake accounts those stake accounts are still not
fully activated after current epoch. But if Solido creates a new stake
account in next epoch (e.g. I make a new deposit) then at the end of
epoch it tries to merger these two account and gets Solana error
"stake account with transient stake cannot be merged". We can't merge
non fully activated stake account from different activation epochs.

Same error is reproduced in Solido v2. If there is lots of SOL in a
reserve account (currently we have ~4_000_000 SOL on mainnet) then
after migrate to v2 instruction it stakes from reserve and stake is
activated partially. And if I try to deposit e.g. 10 SOL, then another
stake account is created and merging those two account fails at epoch
end.

Guess the same error will happen on v1 if I remove all validators and then add a new one. There should be at least 600_000 SOL in the reserve for the error to happen. On local validator Solana activates max 250_000 SOL per epoch.

Misc:
1) Handled "not-yet-upgraded Lido instances can, in theory, be
overwritten by unauthorized users"
2) fixed try_unstake_from_active_validators with no stake accounts

flatten test directory, disable anker tests, update README

unit test: deactivate validator after closing vote account

return test dir hierarchy back, return anker CI for consistency

When validator is deactivated effective stake balance is equal to
stake balance so expected_difference_stake is 0. Thus inactive stake
is not withdrawn by WithdrawInactiveStake following by Unstake instruction
crash because the stake has more than rent exempt amount of inactive
stake which is accumulated during previous stake merging.
So first we withdraw inactive stake and then unstake.

Side note. We should update effective stake balance when merging two
stake accounts

in v2 the error is not reproduced, instead this commit produces a new one

also withdraw inactive stake after merge

solana-labs/solana#24357

1. Create new v2 accounts - validator/maintainer lists, developer fee account
2. Create a migrate transaction

…script.

Implemented solido state verification.

Added install-solido script

…am processor anw