[Add] More debug magicz for misn_lua.

dat/missions/emp_cargo00.lua

@@ -4,7 +4,7 @@ if lang == "es" then
 else -- Default english.
   misn_title  = "Empire Recruitment"
   misn_reward = "%d credits"
-  misn_desc   = "Deliver some parcels for the Empire to %s."
+  misn_desc   = "Deliver some parcels for the Empire to %s in %s."
   title       = {}
   title[1]    = "Spaceport Bar"
   title[2]    = "Empire Recruitment"
@@ -30,6 +30,8 @@ function create()
   if i > 10 then
     misn.finish(false)
   end
+  system = space.getSystem(dest)
+  misn.setMarker(system)
 
   -- Intro text.
  tk.msg(title[1], text[1])
@@ -41,7 +43,7 @@ function create()
     reward = 3000
     misn.setTitle(misn_title)
     misn.setReward(string.format(misn_reward, reward))
-    misn.setDesc(string.format(misn_desc,dest))
+    misn.setDesc(string.format(misn_desc,dest, system))
 
     -- Flavour text and mini-briefing.
     tk.msg(title[2], string.format( text[3], dest))

dat/missions/emp_scout00.lua

@@ -38,6 +38,7 @@ function create()
     misn_target   = "Dune"
     misn_base     = "Omega Station"
     misn_base_sys = "NCG-7291"
+    misn.setMarker(misn_nearby) -- Not exact target.
 
     -- Mission details.
     misn.setTitle(misn_title)
@@ -70,6 +71,7 @@ function enter()
   if misn_stage == 0 and sys == misn_target then
     misn.setDesc(string.format(misn_desc[2],misn_base,misn_base_sys))
     misn_stage = 1
+    misn.setMarker(misn_base_sys) -- Now we mark return to base.
   end
 end
 

dat/missions/es_cargo.lua

@@ -36,6 +36,7 @@ function create()
     misn.finish(false)
   end
   system = space.getSystem( planet )
+  misn.setMarker(system) -- Set system marker.
   misn_dist = space.jumpDist(system)
 
   -- Mission generics.

src/misn_lua.c

@@ -370,14 +370,18 @@ static int misn_setReward(lua_State* L) {
 }
 
 static int misn_setMarker(lua_State* L) {
-  LLUA_MIN_ARGS(1);
   if(lua_isstring(L, 1)) {
     if(cur_mission->sys_marker != NULL) /* Cleanup old markers. */
       free(cur_mission->sys_marker);
     cur_mission->sys_marker = strdup((char*)lua_tostring(L, 1));
+#ifdef DEBUG
+    if(system_get(cur_mission->sys_marker)==NULL)
+      LLUA_DEBUG("Marking unexistant system '%s'", cur_mission->sys_marker);
+#endif
     mission_sysMark();
   }
-  else LLUA_INVALID_PARAMETER();
+  else if(cur_mission->sys_marker != NULL) /* No parameter nullifies. */
+    free(cur_mission->sys_marker);
   return 0;
 }