Replace ESC chars with '.' when viewing messages, support '-<count>' with 'r'.
When reading messages, circumvent ANSI-encoded messages by replacing the ESC character (ASCII 27) with '.'. This could be made an optional behavior if someone really wants ANSI-encoded messages to be read via smbutil. Also, allow continuous reading of 1 or more consecutive messages using the -<digit> option (no prompting).
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