general interface of the BLAS SCAL routines, will call SSCAL, DSCAL, CSCAL, ZSCAL
Usage: call pic_scal(x, [optional] alpha)
where x is the input vector, alpha is the scaling factor.
The vector x must be an allocatable array, we deduce the shape from it.
The scaling factor alpha is 1.0 by default.
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