Add undocumented 'portsnap alfred' command, which runs (fetch|cron) based on whether fd 0 is a terminal, and then runs (extract|update) based on whether ${PORTSDIR} exists.
Add undocumented 'portsnap alfred' command, which runs (fetch|cron)
based on whether fd 0 is a terminal, and then runs (extract|update)
based on whether ${PORTSDIR} exists.

Requested by:	alfred
MFC after:	1 month

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