remove uneeded percentage code

src/misc.vala

@@ -21,17 +21,6 @@ namespace Colegio {
 			INVALIDVERIFIER
 		}
 
-		public class Percentage : Object {
-			public static string format_float (float value) {
-				return (value * 100).to_string () + "%";
-			}
-
-			public static string format_double (double value) {
-				// Remove the double precision by converting to float
-				return ((float) (value * (double) 100)).to_string () + "%";
-			}
-		}
-
 		public class Rut : Object {
 			private string clean_rut;
 			private string pretty_rut;