QR, tall-skinny

Modules
	latsqr: tall-skinny QR factor
	{un,or}gtsqr: generate Q from latsqr
	{un,or}gtsqr_row: generate Q from latsqr
	larfb_gett: step in ungtsqr_row
	lamtsqr: multiply by Q from latsqr
	getsqrhrt: tall-skinny QR factor, with Householder reconstruction
	{un,or}hr_col: Householder reconstruction
	la{un,or}hr_col_getrfnp: LU factor without pivoting
	la{un,or}hr_col_getrfnp2: LU factor without pivoting, level 2

Detailed Description