sciGUI toolbox function

progressionbar - Draw a progression bar

### Calling Sequence

  `winId=progressionbar(mes)`
  `progressionbar(winId[,mes])`

### Parameters

- `mes` : string, message to display.
- `winId` : integer greater than 0, window identificator.

### Description

`progressionbar(mes)` create a new progression bar, return window identificator.

`progressionbar(winId[,mes])` update the progression bar identificated as winId.

### Examples

    winId=progressionbar('Do something');
    realtimeinit(0.3);
    for j=0:0.1:1,
        realtime(3*j);
        progressionbar(winId);
    end
    winclose(winId);

### Author

Jaime Urzua