(add, plane_bomb, pinflak_planedamage, doship, dounit, doplane, laun)

(launch_sat, scra, scut, scuttle_ship, scuttle_land, knockdown)
(ac_planedamage, detonate, attack_val, defense_val, air_damage)
(msl_intercept, msl_launch_mindam, pln_prewrite, shp_prewrite):
Simplify unit destruction: just zero efficiency, leave makelost()
etc. to the prewrite callback.

src/lib/commands/add.c

@@ -137,9 +137,7 @@ add(void)
     snxtitem_all(&ni, EF_LAND);
     while (nxtitem(&ni, &land)) {
 	if (land.lnd_own == coun) {
-	    makelost(EF_LAND, land.lnd_own, land.lnd_uid,
-		     land.lnd_x, land.lnd_y);
-	    land.lnd_own = 0;
+	    land.lnd_effic = 0;
 	    pr("Land unit %d wiped\n", land.lnd_uid);
 	    putland(land.lnd_uid, &land);
 	}