[paragui-users] yet another patch

[H. C.]

- SetBackground(...) works properly now (as does
PG_FileArchive::LoadSurface(...)!)
- eliminated PG_Window's flicker caused by SetTitle(...)
- added simple method to center widgets either horizontally or vertically.
Just set either the width or the height of the widget's rect to 0 and
SetSizeByText() will center the non-null component.
    Examples:
    a)
    PG_Button* button = new PG_Button(NULL, 1, PG_Rect(100, 20, 0, 50), "Hi,
I'm a button");
    // this will center the button vertically and determine its width for
you
    button->SetSizeByText();

    b)
    PG_Button* button = new PG_Button(NULL, 1, PG_Rect(100, 20, 50, 0), "Hi,
I'm a button");
    // this will center the button horizontally and determine its height for
you
    button->SetSizeByText();

kind regards,
    H. C.

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