Changes

* Error UI: If Thunderbird is unsuccessful in its attempts to retrieve explicit configuration parameters from the provider of the file cannot be found, or it's invaliduser’s email service, we ignore the error and go Thunderbird will proceed silently to the other autoconfig possibilities sources of configuration parameters. There is no user interface (database, probing etc.in some conventional sense)to signal an error to the user.* User confirmation: If we find a configThunderbird is successful in its attempts to retrieve explicit configuration parameters from the provider of the user’s email service, we Thunderbird will present it those parameters to the user, . Thunderbird will concurrently provide an affordance (like a button with the label “Create Account”) so that he can glimpse over it before hitting "Create account"the user may express approval of the parameters, which approval will initiate Thunderbird’s storage of the parameters for future use.