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/octave-value/cdef-manager.cc	Fri Jan 10 13:19:38 2020 -0800
+++ b/libinterp/octave-value/cdef-manager.cc	Fri Jan 10 17:25:12 2020 -0800
@@ -790,6 +790,7 @@
           {
             all_handle_compatible = all_handle_compatible
               && cl.get ("HandleCompatible").bool_value ();
+
             has_handle_class = has_handle_class || cl.is_handle_class ();
           }