PORT: fix display of durations on the acquisition panel

[bls337]

The 1.4 diSPIM plugin uses getNumTimepoints() which always returns 1 if time points are enabled, LSM was using acqSettings_.numTimePoints() directly, LSM now matches the behavior of the original plugin in computeActualTimeLapseDuration() => computeTotalTimeDuration().

There was also a GUI display bug in the port of the code where it would only write the seconds in the // between 1 min and 1 hour branch and only write the minutes in the // longer than 1 hour branch. Very clear bug.

There was another place in AcquisitionEngineScape.java that used acqSettings_.numTimePoints() directly when it needed to clamp the value to 1 if time points are not enabled.

The number of time points could be a left over value such as 10 and trigger this code even if not enabled.

TODO: it looks like I missed the ! in the port for item 3, I will add this in one of the next commits.

   // Item 1
   private int getNumTimepoints() {
      if (useTimepointsCB_.isSelected()) {
         return (Integer) numTimepoints_.getValue();
      } else {
         return 1;
      }
   }
   
   private double computeActualTimeLapseDuration() {
      double duration = (getNumTimepoints() - 1) * getTimepointInterval() 
            + computeTimepointDuration()/1000;
      return duration;
   }
   
    // Item 2
    private void updateActualTimeLapseDurationLabel() {
      String s = "";
      double duration = computeActualTimeLapseDuration();
      if (duration < 60) {  // less than 1 min
         s += NumberUtils.doubleToDisplayString(duration) + " s";
      } else if (duration < 60*60) { // between 1 min and 1 hour
         s += NumberUtils.doubleToDisplayString(Math.floor(duration/60)) + " min ";
         s += NumberUtils.doubleToDisplayString(Math.round(duration %  60)) + " s";
      } else { // longer than 1 hour
         s += NumberUtils.doubleToDisplayString(Math.floor(duration/(60*60))) + " hr ";
         s +=  NumberUtils.doubleToDisplayString(Math.round((duration % (60*60))/60)) + " min";
      }
      actualTimeLapseDurationLabel_.setText(s);
   }
   
      // Item 3   
      // make sure we aren't trying to collect timepoints faster than we can
      if (!acqSettings.useMultiPositions && acqSettings.numTimepoints > 1) {
         if (timepointIntervalMs < volumeDuration) {
            MyDialogUtils.showError("Time point interval shorter than" +
                  " the time to collect a single volume.", hideErrors);
            return AcquisitionStatus.FATAL_ERROR;
         }
      }