and reimplement 'sparse' mode (TTYINV=2 or TTYINV=3).
When hero had no inventory except for gold and perminv display mode is
ignoring gold, the header said "empty" when "only gold" was intended.
Sparse mode populates perminv with inventory letters in the unused
slots instead of leaving them blank. (The core doesn't need to be
aware of that since it doesn't affect what display_inventory() sends
to the inventory menu.)
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