T: eliminate the 'gender' variable by using the SUF gender= key

data/campaigns/tutorial/lua/character_selection.lua

@@ -87,17 +87,14 @@ function wml_actions.select_character()
 
 	local character = wesnoth.show_dialog(character_selection_dialog)
 	local unit = wesnoth.get_variable("student_store")
-	local gender = "male"
 
 	if character == 2 then
-		gender = "female"
-
 		unit.type    = "Fighteress"
 		unit.name    = "Li’sar"
+		unit.gender  = "female"
 		unit.profile = "portraits/lisar.png"
 	end
 
-	wesnoth.set_variable("gender", gender)
 	wesnoth.put_unit(unit)
 	wesnoth.redraw {}
 end

data/campaigns/tutorial/scenarios/02_Tutorial_part_2.cfg

@@ -421,20 +421,20 @@
             [/objective]
             [objective]
                 [show_if]
-                    [variable]
-                        name=gender
-                        not_equals=female
-                    [/variable]
+                    [have_unit]
+                        id=student
+                        gender=male
+                    [/have_unit]
                 [/show_if]
                 description= _"Death of Konrad"
                 condition=lose
             [/objective]
             [objective]
                 [show_if]
-                    [variable]
-                        name=gender
-                        equals=female
-                    [/variable]
+                    [have_unit]
+                        id=student
+                        gender=female
+                    [/have_unit]
                 [/show_if]
                 description= _"Death of Li’sar"
                 condition=lose

data/campaigns/tutorial/utils/utils.cfg

@@ -45,10 +45,10 @@
 
 #define GENDER MALE_WML FEMALE_WML
     [if]
-        [variable]
-            name=gender
-            equals=male
-        [/variable]
+        [have_unit]
+            id=student
+            gender=male
+        [/have_unit]
         [then]
             {MALE_WML}
         [/then]