Level 0 BLAS-like scalar ops

Modules
	isnan: test for NaN
	laisnan: test for NaN, unoptimized
	ladiv: complex divide
	lapy2: robust sqrt( x^2 + y^2 )
	lapy3: robust sqrt( x^2 + y^2 + z^2 )
	larmm: scale factor to avoid overflow, step in latrs

Detailed Description

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