cleanup

- fix possible crash in conc (but it's still an ugly hack)
- fix noob usage of strcmp
- flag some memory leaks (it would be nice, if the author(s) would clean
   up the mess himself)
- fix crash in substr
- whitespace cleanup

there are plenty more memory leaks in command.cpp - for example, every
goto in cubescript does not clean up anything

source/src/entity.h

@@ -387,15 +387,15 @@ public:
             case 3: ad = (int) (4.0f/25.0f * armour) + 25; break;         // 41
             default: break;
         }
-        
+
         //ra - reduced armor
         //rd - reduced damage
         int ra = (int) (ad * damage/100.0f);
         int rd = ra-(ra*(gi.piercing/100.0f)); //Who cares about rounding errors anyways?
-        
+
         armour -= ra;
         damage -= rd;
-            
+
         health -= damage;
         return damage;
     }
@@ -672,4 +672,4 @@ struct package
 
     package() : name(NULL), type(-1), number(0), pending(false), source(NULL), curl(NULL) {}
 };
-#endif
+#endif