Note that delivery thresholds are stored as multiples of 8. If you
specify a threshold that is not a multiple of 8, it will be rounded down.
.s1
+Delivery will not ship out the last civilian or the last military if
+there are no civilians, regardless of thresholds.
+.s1
The direction must be specified as one of the six direction characters,
(usually `y' `u' `j' `n' `b' or `g'), the \*Qno-direction\*U character,
(usually `h'). If no direction is specified, then the direction will