maint: More cleanup of C++ code to follow Octave coding conventions. * gl-select.cc, betainc.cc, bitfcns.cc, bsxfun.cc, gl-render.cc, graphics.cc, load-save.cc, ls-mat-ascii.cc, ls-mat5.cc, lu.cc, oct-stream.cc, symtab.cc, variables.cc, __eigs__.cc, __magick_read__.cc, chol.cc, ov-base-sparse.cc, ov-class.cc, ov-classdef.cc, ov-fcn-inline.cc, ov-perm.cc, ov.cc, CMatrix.cc, CSparse.cc, MSparse.cc, MatrixType.cc, MatrixType.h, dMatrix.cc, dSparse.cc, fCMatrix.cc, fMatrix.cc, eigs-base.cc, lo-sysdep.cc, kpse.cc: Break long lines before && and ||.

--- a/libinterp/corefcn/lu.cc
+++ b/libinterp/corefcn/lu.cc
@@ -593,8 +593,8 @@
   octave_idx_type k = u.rows ();
   octave_idx_type n = u.columns ();
   return ((l.ndims () == 2 && u.ndims () == 2 && k == l.columns ())
-          && k == std::min (m, n) &&
-          (p.is_undefined () || p.rows () == m));
+          && k == std::min (m, n)
+          && (p.is_undefined () || p.rows () == m));
 }
 
 DEFUN (luupdate, args, ,