4.0.2 made land unit mobility costs differ significantly from normal

move costs, but failed to make A* use these costs.  This broke land
unit path finding.  Fix:
(MOB_ROAD, MOB_MOVE, MOB_MARCH): Split MOB_ROAD into MOB_MOVE and
MOB_MARCH.  Users changed.
(lnd_mobcost, sector_mcost): Move minimum mobcost logic to
sector_mcost(), where it is visible to A*.  Also fixes unit reaction
path cost.

(lnd_path): Fix confusing message: don't claim there's no path when
all we really know is that there's no railway.

src/lib/common/path.c

@@ -342,7 +342,7 @@ BestDistPath(char *path,
 	     struct sctstr *from,
 	     struct sctstr *to, double *cost)
 {
-    return BestLandPath(path, from, to, cost, MOB_ROAD);
+    return BestLandPath(path, from, to, cost, MOB_MOVE);
 }
 
 char *