Report was for 'F' followed by '.' reporting "cmdassist: Invalid
direction key!" and then by a direction grid (which happened to
include '.' for self). That behavior applied for all the movement
prefix keys ('m', 'G', &c). When 'cmdassist' was off, "F." would
yield "Unknown command 'F.'." instead.
Now you'll get "You can't fight yourself.", either instead of the
"invalid direction key" part of cmdassist feedback (followed by a
direction grid which excludes up, down, and self since they aren't
applicable for prefix keys) or of the "unknown command" result.
Likewise, "You can't run upward." or "You can't rush downward."
for "G<" and "g>", respectively.
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