/// <summary>
/// True, if list is equal to this
/// </summary>
/// <param name="list">list</param>
/// <returns>True, if instance euqals list</returns>
public Boolean Equals(EquatableList<T> list)
{
if (list == null) return false;
foreach (T t in this) if (!list.Contains(t)) return false;
foreach (T t in list) if (!this.Contains(t)) return false;
return true;
}
