maint: Use Octave coding conventions in libinterp/ * __ftp__.cc, __ichol__.cc, call-stack.cc, error.h, event-manager.cc, file-io.cc, gl-render.cc, graphics.cc, help.cc, input.cc, interpreter.cc, load-path.cc, load-save.cc, ls-hdf5.cc, ls-hdf5.h, mex.cc, oct-hist.cc, oct-stream.cc, sighandlers.h, stack-frame.cc, stack-frame.h, strfns.cc, syminfo.cc, sysdep.cc, text-engine.h, url-handle-manager.h, urlwrite.cc, xpow.cc, __init_fltk__.cc, __ode15__.cc, ccolamd.cc, colamd.cc, cdef-class.cc, cdef-manager.cc, cdef-manager.h, cdef-method.cc, cdef-object.cc, cdef-package.h, cdef-property.cc, ov-class.cc, ov-classdef.cc, ov-cx-sparse.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-fcn.h, ov-java.cc, ov-typeinfo.h, bp-table.cc, jit-ir.h, jit-typeinfo.h, pt-classdef.h, pt-eval.cc, pt-eval.h, pt-idx.cc: Use Octave coding conventions in libinterp.

--- a/libinterp/corefcn/__ichol__.cc	Fri Jan 10 13:19:38 2020 -0800
+++ b/libinterp/corefcn/__ichol__.cc	Fri Jan 10 17:25:12 2020 -0800
@@ -246,7 +246,7 @@
   max_len += (0.1 * max_len) > n ? 0.1 * max_len : n;
   Array <octave_idx_type> cidx_out_l (dim_vector (n + 1, 1));
   octave_idx_type *cidx_l = cidx_out_l.fortran_vec ();
-  Array <octave_idx_type> ridx_out_l (dim_vector (max_len ,1));
+  Array <octave_idx_type> ridx_out_l (dim_vector (max_len, 1));
   octave_idx_type *ridx_l = ridx_out_l.fortran_vec ();
   Array <T> data_out_l (dim_vector (max_len, 1));
   T* data_l = data_out_l.fortran_vec ();