maint: Clean up #includes in liboctave/numeric directory. * build-aux/mk-opts.pl: Change Perl to generate "" around local include libraries rather than <>. Include "lo-math.h" rather than <cmath>. * CollocWt.cc, DAERTFunc.h, DASPK.cc, DASPK.h, DASRT.cc, DASRT.h, DASSL.cc, DASSL.h, DET.h, EIG.cc, EIG.h, LSODE.cc, LSODE.h, ODE.h, ODES.cc, ODESFunc.h, Quad.cc, aepbalance.cc, base-de.h, base-min.h, bsxfun-decl.h, bsxfun-defs.cc, bsxfun.h, chol.cc, eigs-base.cc, fEIG.cc, fEIG.h, gepbalance.cc, gsvd.cc, hess.cc, lo-blas-proto.h, lo-lapack-proto.h, lo-mappers.cc, lo-mappers.h, lo-qrupdate-proto.h, lo-slatec-proto.h, lo-specfun.cc, lo-specfun.h, lu.cc, lu.h, oct-convn.cc, oct-convn.h, oct-fftw.cc, oct-fftw.h, oct-norm.cc, oct-rand.cc, oct-rand.h, oct-spparms.cc, oct-spparms.h, qr.cc, qr.h, qrp.cc, randgamma.cc, randpoisson.cc, schur.cc, schur.h, sparse-chol.cc, sparse-chol.h, sparse-dmsolve.cc, sparse-lu.cc, sparse-lu.h, sparse-qr.cc, sparse-qr.h, svd.cc: Rationalize #includes. Use forward declarations of just classes where possible. Reformat some long lines < 80 characters. Reformat some comments for readabliity. * mx-inlines.cc: Rationalize #includes for this file in liboctave/operators used by many in liboctave/numeric.

--- a/liboctave/numeric/hess.cc	Mon May 08 20:58:14 2017 -0700
+++ b/liboctave/numeric/hess.cc	Tue May 09 08:46:07 2017 -0700
@@ -24,6 +24,7 @@
 #  include "config.h"
 #endif
 
+#include "Array.h"
 #include "CMatrix.h"
 #include "dMatrix.h"
 #include "fCMatrix.h"
@@ -39,7 +40,7 @@
     template <>
     octave_idx_type
     hess<Matrix>::init (const Matrix& a)
-    {
+   {
       F77_INT a_nr = octave::to_f77_int (a.rows ());
       F77_INT a_nc = octave::to_f77_int (a.cols ());