F6 is fantastic, until you hit it by mistake after dieing when you meant
to hit F9 (I've done that way too often). quick.sav is still the last file
written via F6 (so F9 is unaffected), but now the previous quick.sav
becomes quick1.sav. Up to 5 (currently) backups will be kept: quick1 is
the newest, quick5 the oldest. A menu for accessing the backups has been
added as a sub-menu of the load menu.
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