#157 ARexx - MAILLISTFREEZE / MAILLISTTHAW and auto mark-as-read

[AmigaPhil]

MAILLISTFREEZE should also disable the "auto mark-as-read" behavior; otherwise, by the time mails are downloaded, one or more mails are marked as "read" and thus lose their "new" status (and so, the ARexx script configured for new mails won't apply to them).
MAILLISTTHAW will then restore the previous behavior.

[AmigaPhil]

Moved it from feature request, as it's more a bug.