Inccorect documentation for -b option of lapack_testing.py

[svillemot]

The help notice for lapack_testing.py says that the default value for the -b option is the current directory (.).

However, when this option is not passed, the script looks into the bin/Release subfolder of the present directory.

Note that this is functional change in release 3.9.0. In previous releases, the script would look in the current directory.

[christoph-conrads]

fixed by commit 89e8b89

[langou]

Thanks @svillemot, thanks @christoph-conrads.