Eig computational routines

Modules
	disna: eig condition numbers
	{he,sy}trd: reduction to tridiagonal
	{he,sy}td2: reduction to tridiagonal, level 2
	latrd: step in hetrd
	{un,or}gtr: generate Q from hetrd
	{un,or}mtr: multiply by Q from hetrd
	{he,sy}trd_he2hb: full to band (1st stage)
	{hb,sb}2st_kernels: band to tridiagonal (2nd stage)
	lae2: 2x2 eig, step in steqr, stemr
	laesy: 2x2 eig
	laev2: 2x2 eig

Detailed Description

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