(get_empobjp): New. Returns a pointer an empobj.

(emp_obj_chr_name): New. Returns a pointer to the characteristics name
for an empobj.
(unit_map):  Simplify unit_map() by using get_empobjp() and
emp_obj_chr_name().
(map,  cmd_move_map):  Switch to EF_SHIP as unit_map does not default
to EF_SHIP for EF_BAD anymore.

src/lib/commands/map.c

@@ -43,7 +43,7 @@
 int
 map(void)
 {
-    int unit_type = EF_BAD;
+    int unit_type = EF_SHIP;
     int bmap = 0;
     char *str;
     char buf[1024];