sciGUI toolbox function

waitbar - Draw a waitbar

### Calling Sequence

  `winId=waitbar(x)`
  `winId=waitbar(x,mes)`
  `winId=waitbar(mes)`
  `waitbar(x,winId)`
  `waitbar(mes,winId)`
  `waitbar(x,mes,winId)`

### Parameters

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

### Description

`waitbar(x)` create a new waitbar displaying a fraction x, return window identificator.

`waitbar(x,mes)` create a new waitbar displaying a fraction x and message mes, return window identificator.

`waitbar(mes)` create a new waitbar displaying a fraction 0 and message mes, return window identificator.

`waitbar(x,mes)` create a new waitbar displaying a fraction 0 and message mes, return window identificator.

`waitbar(x,winId)` , `waitbar(mes,winId)` and `waitbar(x,mes,winId)` update waitbar with window identificator winId.

### Examples

    winId=waitbar('This is an example');
    realtimeinit(0.3);
    for j=0:0.1:1,
        realtime(3*j);
        waitbar(j,winId);
    end
    winclose(winId);

### Author

Jaime Urzua