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* Move password authentication handling into sshd/auth (fixes #394). Password authentication is now completely handeled in Auth. The normal keyboard-interactive handler checks if passwords are supported and asks for them, removing the need to override the callbacks. Brute force throttling is removed; I'd like to base it on IP address banning, which requires changes to the checks. I'm not sure, but I think timing attacks against the password are fixed: - The hashing of the real password happens only at startup. - The hashing of a provided password is something an attacker can do themselves; It doesn't leak anything about the real password. - The hash comparison is constant-time. * refactor checks, IP-ban incorrect passphrases, renames - s/assword/assphrase/, typo fixes - bans are checked separately from public keys - an incorrect passphrase results in a one-minute IP ban - whitelists no longer override bans (i.e. you can get banned if you're whitelisted) * (hopefully) final changes