Fix bug with constraints

Also initialise constraint matrix with total number of seats

src/election.rs

@@ -236,6 +236,11 @@ impl<'a, N: Number> CountState<'a, N> {
 			cm.init();
 			//println!("{}", cm);
 			
+			// Require correct number of candidates to be elected
+			let idx = vec![0; constraints.0.len()];
+			cm[&idx].min = election.seats;
+			cm[&idx].max = election.seats;
+			
 			state.constraint_matrix = Some(cm);
 		}