[Wien] 'symmetry' in 12.1

[Stefaan Cottenier]

> ATOM   3: X=0.16666666 Y=0.00000000 Z=0.49999999
>
> to
>
> ATOM   3: X=0.16666666 Y=0.00000000 Z=0.50000000

Thanks for this quick solution and all comments. I had used patchsymm 
previously, but only to correct deviations introduced by min_lapw. And 
to my experience there were no problems with rounding errors in the very 
last digit -- it turns out now, however, that this is true for ...6667, 
but not for ...9999.

Stefaan