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.

--- a/liboctave/operators/mx-defs.h	Thu Aug 04 07:50:31 2016 +0200
+++ b/liboctave/operators/mx-defs.h	Tue Aug 09 18:02:11 2016 +0200
@@ -66,7 +66,7 @@
 
 class EIG;
 
-class GSVD;
+template <typename T> class gsvd;
 
 template <typename T> class hess;