Introduce [race]undead_variation as a default for the race's [unit_type]s

changelog

@@ -109,6 +109,7 @@ Version 1.9.9+svn:
    * Implemented $second_unit being bound to the acting leader in recall/recruit events
    * Added [secondary_unit] SUF for filtering the recalling leader in [recall] action WML
    * Introduce [redraw]clear_shroud=yes|no and [redraw]<SSF> support
+   * Introduce [race]undead_variation as a default for the race's [unit_type]s
  * Miscellaneous and bug fixes:
    * Add --language/-L commandline option to set the language for that session
    * Fixed: Avoid copying of singular iterators in the whiteboard code

data/scenario-test.cfg

@@ -309,6 +309,23 @@ Xu          , Xu          , Qxu         , Qxu         , Ql          , Ql
             type="Silver Mage"
             name= "Hidden Teleporter"
         [/unit]
+        [unit]
+            x,y=18,10
+            type="Soulless"
+            [modifications]
+                [object]
+                    silent=yes
+                    [effect]
+                        apply_to=attack
+                        increase_damage=50
+                    [/effect]
+                    [effect]
+                        apply_to=hitpoints
+                        increase_total=300
+                    [/effect]
+                [/object]
+            [/modifications]
+        [/unit]
     [/side]
     [side]
         side=3

src/race.cpp

@@ -146,7 +146,8 @@ unit_race::unit_race() :
 		chain_size_(0),
 		traits_(empty_traits().child_range("trait")),
 		topics_(empty_topics().child_range("topic")),
-		global_traits_(true)
+		global_traits_(true),
+		undead_variation_()
 {
 		name_[MALE] = "";
 		name_[FEMALE] = "";
@@ -161,7 +162,8 @@ unit_race::unit_race(const config& cfg) :
 		chain_size_(cfg["markov_chain_size"]),
 		traits_(cfg.child_range("trait")),
 		topics_(cfg.child_range("topic")),
-		global_traits_(!cfg["ignore_global_traits"].to_bool())
+		global_traits_(!cfg["ignore_global_traits"].to_bool()),
+		undead_variation_(cfg["undead_variation"])
 
 {
 	if (id_.empty()) {

src/race.hpp

@@ -47,6 +47,7 @@ public:
 	const config::const_child_itors &additional_traits() const;
   const config::const_child_itors &additional_topics() const;
 	unsigned int num_traits() const;
+	const std::string& undead_variation() const { return undead_variation_; };
 
 private:
 	const config cfg_;
@@ -62,6 +63,7 @@ private:
 	config::const_child_itors traits_;
   config::const_child_itors topics_;
 	bool global_traits_;
+	std::string undead_variation_;
 };
 
 unit_race::GENDER string_gender(const std::string& str,unit_race::GENDER def=unit_race::MALE);

src/unit_types.cpp

@@ -714,6 +714,9 @@ void unit_type::build_full(const movement_type_map &mv_types,
 					possibleTraits_.add_child("trait", t);
 			}
 		}
+		if (undead_variation_.empty()) {
+			undead_variation_ = race_->undead_variation();
+		}
 	}
 
 	// Insert any traits that are just for this unit type