Generalized eig computational routines

Modules
	ggbal: balance matrix
	gghrd: reduction to Hessenberg
	gghd3: reduction to Hessenberg, level 3
	hgeqz: generalized Hessenberg eig
	ggbak: back-transform eigvec
	tgsen: reorder generalized Schur form
	tgsna: reciprocal cond est
	tgsyl: Sylvester equation
	tgsy2: Sylvester equation panel (?)
	{un,or}m22: multiply by banded Q, step in gghd3
	lagv2: 2x2 generalized Schur factor
	tgevc: eigvec of pair of matrices
	tgexc: reorder generalized Schur form
	tgex2: reorder generalized Schur form

Detailed Description