Integer to Hex QString

This function takes an integer and returns a QString with the exadecimal representation:
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```c
QString val2hex( int d )
{
    QString Hex="0123456789ABCDEF";

    QString h = Hex.mid( d&15, 1 );

    while( d>15 )
    {
        d >>= 4;
        h = Hex.mid( d&15,1 ) + h;
    }
    return h;
}
```

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