In mask, made default MASK parameter work when FROM cube has multiple bands....

#include "Isis.h"

#include <QDebug>

#include "ProcessByLine.h"

#include "SpecialPixel.h"

#include "IException.h"

  // Setup the input and output cubes

  UserInterface &ui = Application::GetUserInterface();

  if(!ui.WasEntered("MASK"))

    ui.PutAsString("MASK", ui.GetAsString("FROM"));

  p.SetInputCube("FROM");

  if(!ui.WasEntered("MASK")) {

    p.SetInputCube("FROM");

  }

  else {

    try {

      p.SetInputCube("MASK", OneBand);

    }

    catch (IException &e) {

      QString msg = "The MASK input must be a single band.";

      throw IException(e, IException::User, msg, _FILEINFO_);

    }

  }

  p.SetOutputCube("TO");

  //  Get min/max info