Set SCALE early for robust triangular solvers

[angsch]

Update robust triangular solver LATRS and robust banded triangular solver LATBS.

1. The docs define SCALE as an output argument. Set SCALE before the quick return case to have SCALE set (to the expected value 1.0) in all cases. This is how the similar routine TRSYL handles the corner case already.

2. Remove invocations of LABAD in complex routines and be consistent with the real counterparts, which do not call LABAD.

[angsch]

@weslleyspereira Thanks for your review. The remaining data types have been added; the link to the issue has been moved to the commit message.

In view of #96, I did not reintroduce LABAD.

[weslleyspereira]

Thanks for citing issue #96 ! I talked to Jim Demmel and other people, and they recommended removing those calls as well.

Weslley

On Sun, Sep 25, 2022 at 10:22 AM angsch @.***> wrote:

@weslleyspereira https://github.com/weslleyspereira Thanks for your review. The remaining data types have been added; the link to the issue has been moved to the commit message.

In view of #96 https://github.com/Reference-LAPACK/lapack/issues/96, I did not reintroduce LABAD.

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