Update lin2mu, mu2lin functions. * lin2mu.m: Rewrite docstring. Use default argument for input 'n' to simply input validation. Eliminate warning abut no precision certified. Add stricter input validation 'n' input. Use inplace operators for better performnace. Update BIST tests. * mu2lin.m: Rewrite docstring. Use default argument for input 'n' to simply input validation. Add BIST tests for function.

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[*.{am,mk}]
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