gsvd: reduce code duplication with templates. * CmplxGSVD.cc, CmplxGSVD.h, dbleGSVD.cc, dbleGSVD.h: Remove files for no longer existing classes. Replaced by gsvd template class. This classes never existed in an Octave release, this was freshly imported from Octave Forge so backwards compatibility is not an issue. * liboctave/numeric/gsvd.h, liboctave/numeric/gsvd.cc: New files for gsvd class template generated from CmplxGSVD.cc, CmplxGSVD.h, dbleGSVD.cc, and dbleGSVD.h and converted to template. Removed unused << operator, unused constructor with &info, and commented code. Only instantiated for Matrix and ComplexMatrix, providing interface to DGGSVD and ZGGSVD. * liboctave/numeric/module.mk: Update. * mx-defs.h, mx-ext.h: Use new classes.

ec48ad192f8f2b60a58e032924a53529903d1bcb gnulib