Hide skills with level 0 and 0 experience points

- Hide skills with level 0 and 0 experience points
- Tabs to spaces

tools/playground/skillmodify.cpp

@@ -20,6 +20,7 @@
  * - Kill/revive creature(s) with --kill/--revive
  * - Show skills/labors only when -ss/-sl/-v is given or a skill/labor is changed
  * - Allow multiple -i switches
+ * - Hide skills with level 0 and 0 experience points
 
  * Done:
  * - Add switch -1 to only display one line for every creature. Good for an overview.
@@ -311,10 +312,13 @@ void printCreature(DFHack::Context * DF, const DFHack::t_creature & creature, in
                     skillname = "Unknown skill";
                     cout << e.what() << endl;
                 }
+                if (skillrating > 0 || skillexperience > 0) 
+                {
                     cout << "(Skill " << int(skillid) << ") " << setw(16) << skillname << ": " 
                         << skillrating << "/" << skillexperience << endl;
                 }
             }
+        }
 
         for(unsigned int i = 0; i < NUM_CREATURE_LABORS;i++)
         {