[bug #48807] gsvd function needs matlab compatible interface

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Follow-up Comment #33, bug #48807 (group octave):=0A=0AA new attempt. As fa=
r as I can tell it is vwery close to Matlab's performance=0Aand precision (=
somewhat depending on the underlying BLAS).=0A(file bug48807_gsvd_20260703_=
100.cset)=0AThis is against hg id (dd2362b5242f tip @).=0AThe same implemen=
tation ported to stable branch (for those who want to try it=0Aon pre Octav=
e-12):=0A(file new_gsvd_stable_20260703_100.diff)=0AAnd if that fails, the =
actual files:=0A(file new_gsvd_stable_files_20260703_100.tgz)=0A=0ADmitri.=
=0A-- =0A=0A=0A(file #58780, file #58781, file #58782)=0A=0A    ___________=
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