Time-Based One-Time Password added and bugs fixed

added return false if aauth_error_no_pm appears
added return by delete_user()
changed NULL to FALSE by get_perm_id()
fixed login error after TOTP check (login with wrong pw fixed
added configuration to not use cookies if sessions are enabled.
added min password length
changed some default config vars
added totp_only_on_ip_change
changed totp_active default value to false
fixed a failure
fixed a error on login without totp_code
added totp_reset_over_reset_password and update_user_totp_secret()
added Time-Based One-Time Password
variable scope undefined fix!
function remind_password: return TRUE/FALSE.
Fixing typos in functions user_exist_by_email user_exist_by_name