make better use of templates for Schur decomposition * liboctave/numeric/schur.h, liboctave/numeric/schur.cc: New files generated from SCHUR.h, SCHUR.cc, CmplxSCHUR.h, CmplxSCHUR.cc, dbleSCHUR.h, dbleSCHUR.cc, fCmplxSCHUR.h, fCmplxSCHUR.cc, floatSCHUR.h, and floatSCHUR.cc and making them templates. * liboctave/numeric/module.mk: Update. * libinterp/corefcn/schur.cc, sqrtm.cc, CMatrix.cc, dMatrix.cc, fCMatrix.cc, fMatrix.cc, mx-defs.h, mx-ext.h: Use new template classes and header file.

gnulib-hg = gnulib-hg