Rename all the election operations (#6245)

* Rename and move sp-phragmen

* More renames for equalise

* Update main module doc

* Fix line width

* Line width

substrate/primitives/npos-elections/fuzzer/src/common.rs

@@ -0,0 +1,30 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2020 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Common fuzzing utils.
+
+/// converts x into the range [a, b] in a pseudo-fair way.
+pub fn to_range(x: usize, a: usize, b: usize) -> usize {
+	// does not work correctly if b < 2 * a
+	assert!(b >= 2 * a);
+	let collapsed = x % b;
+	if collapsed >= a {
+		collapsed
+	} else {
+		collapsed + a
+	}
+}