Returning to bug 113: std.format.doFormat and small hex numbers

[Artem Rebrov]

To fix the bug in std\format.d lines (from #874)
   if (precision == 0 || !(flags & FLprecision))
     {
     vchar = '0' + vnumber;
     goto L2;
     }
should be changed to
   if (precision == 0 || !(flags & FLprecision))
     {
     if (vnumber < 10)
        vchar = '0' + vnumber;
     else
        vchar = (uc ? 'A' : 'a') + (vnumber - 10);
     goto L2;
     }
It's easy to do.

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