lei forget-search: new command to forget saved searches

Readers may lose interest in subscription topics.  This lets
them avoid clutter by forgetting a saved search.

This does not and will not destroy the contents of an --output
mailbox.  In other words, this is similar to unsubscribing
from an Atom/RSS feed or NNTP group.

I've also decided we won't support 'mv-search', since it'll
probably be rarely used and "lei convert" can be used, instead.

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