Integer to any base QString

This function takes an integer and returns a QString with the representation in any base < 16.

It uses the val2hex function from previous post:
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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;
}

QString decToBase( int value, int base, int digits )
{
    QString converted = "";

    for( int i=0; i= base ) converted = val2hex(value%base) + converted;
        else                converted = val2hex(value) + converted;

        value = floor( value/base );
    }
    return converted;
}
```

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