Delete proxy and total samples, which have bit-rotted.

samples/total/client/RowCol.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- * An object containing a (row, column) reference.
- *
- * Objects of this class are immutable: they do not change after creation.
- */
-class RowCol implements Hashable {
-
-  static int hashOneValue(int val) {
-    final int fnvPrime = 0x01000193;
-    int output = fnvPrime;
-    int octet1 = val & 0xff;
-    output ^= octet1;
-    output *= fnvPrime;
-    int octet2 = (val >> 8) & 0xff;
-    output ^= octet2;
-    output *= fnvPrime;
-    int octet3 = (val >> 16) & 0xff;
-    output ^= octet3;
-
-    return output;
-  }
-
-  final int _col;
-  final int _row;
-
-  int get col() => _col;
-
-  int get row() => _row;
-
-  RowCol(this._row, this._col) { }
-
-  bool operator ==(RowCol other) {
-    if (!(other is RowCol)) {
-      return false;
-    }
-    return other._row == _row && other._col == _col;
-  }
-
-  RowCol operator +(RowCol other) => new RowCol(_row + other._row, _col + other._col);
-
-  int hashCode() => (51 + hashOneValue(_row)) * 51 + hashOneValue(_col);
-
-  bool isValidCell() => _row > 0 && _col > 0;
-
-  String toA1String() => "${StringUtils.columnString(_col)}${_row}";
-
-  String toString() => "R${_row}C${_col}";
-
-  RowCol translate(int deltaRow, int deltaCol) => new RowCol(_row + deltaRow, _col + deltaCol);
-}
-