[Scalapack] complex pivoted qr factorisation

[Sven Hammarling]

Dear Jim,

Unless I misunderstand (quite likely!), I think that Zlatko and Zvonimir 
showed a similar example in Figure 1 of LAWN 176 - it certainly has a 
deep spike.

Once ScaLAPACK gets the LAPACK fix it will be interesting to see the 
result on David's example.

Best wishes,

Sven.