simple_wallet::seed()
- Check that wallet is deterministic.
simple_wallet::new_wallet()
- Prompt for seed language only if it's a non-deterministic wallet,
along with previous conditions.
simple_wallet::open_wallet()
- Fixed check for deterministic wallet (flag based on command line
non-deterministic argument was used before, but it's inapplicable to
opening an existing wallet).
- As with deterministic wallet, non-deterministic also included to be
rewritten to new JSON format file. That's what's done for newly
generated non-deterministic wallets, so old versions should be
updated to same format.