maint: style check C++ ahead of 4.4 release. * ButtonGroup.cc, Canvas.cc, Figure.cc, GLCanvas.cc, GLCanvas.h, ListBoxControl.cc, ObjectProxy.cc, QTerminal.h, dialog.cc, documentation.cc, files-dock-widget.cc, history-dock-widget.cc, file-editor-tab.cc, file-editor.h, find-dialog.cc, marker.h, octave-qscintilla.cc, octave-qscintilla.h, main-window.cc, webinfo.cc, resource-manager.h, settings-dialog.cc, shortcut-manager.cc, shortcut-manager.h, variable-editor.cc, workspace-view.cc, build-env.in.cc, __ilu__.cc, cellfun.cc, data.cc, dirfns.cc, dynamic-ld.h, environment.cc, error.cc, fcn-info.cc, gl-render.cc, gl2ps-print.cc, graphics.cc, graphics.in.h, help.cc, interpreter.cc, load-path.cc, load-save.cc, ls-mat5.cc, mex.cc, oct-stream.cc, oct-stream.h, qz.cc, sighandlers.cc, sparse-xpow.cc, svd.cc, symscope.h, symtab.cc, symtab.h, sysdep.cc, url-handle-manager.h, utils.cc, variables.cc, __init_fltk__.cc, __ode15__.cc, gzip.cc, ov-base.cc, ov-builtin.h, ov-cell.cc, ov-class.cc, ov-dld-fcn.h, ov-fcn-handle.cc, ov-java.cc, ov-re-diag.cc, op-b-sbm.cc, op-bm-b.cc, op-bm-bm.cc, op-bm-sbm.cc, op-cdm-cdm.cc, op-cell.cc, op-cm-cm.cc, op-cm-cs.cc, op-cm-m.cc, op-cm-s.cc, op-cm-scm.cc, op-cm-sm.cc, op-cs-cm.cc, op-cs-cs.cc, op-cs-m.cc, op-cs-s.cc, op-cs-scm.cc, op-cs-sm.cc, op-dm-dm.cc, op-dm-scm.cc, op-dm-sm.cc, op-fcdm-fcdm.cc, op-fcm-fcm.cc, op-fcm-fcs.cc, op-fcm-fm.cc, op-fcm-fs.cc, op-fcs-fcm.cc, op-fcs-fcs.cc, op-fcs-fm.cc, op-fcs-fs.cc, op-fdm-fdm.cc, op-fm-fcm.cc, op-fm-fcs.cc, op-fm-fm.cc, op-fm-fs.cc, op-fs-fcm.cc, op-fs-fcs.cc, op-fs-fm.cc, op-fs-fs.cc, op-m-cm.cc, op-m-cs.cc, op-m-m.cc, op-m-s.cc, op-m-scm.cc, op-m-sm.cc, op-pm-pm.cc, op-pm-scm.cc, op-pm-sm.cc, op-range.cc, op-s-cm.cc, op-s-cs.cc, op-s-m.cc, op-s-s.cc, op-s-scm.cc, op-s-sm.cc, op-sbm-b.cc, op-sbm-bm.cc, op-sbm-sbm.cc, op-scm-cm.cc, op-scm-cs.cc, op-scm-m.cc, op-scm-s.cc, op-scm-scm.cc, op-scm-sm.cc, op-sm-cm.cc, op-sm-cs.cc, op-sm-m.cc, op-sm-s.cc, op-sm-scm.cc, op-sm-sm.cc, op-str-m.cc, op-str-s.cc, op-str-str.cc, bp-table.cc, comment-list.h, jit-ir.h, jit-typeinfo.cc, jit-typeinfo.h, lex.h, parse.h, pt-binop.h, pt-decl.h, pt-eval.cc, pt-jit.cc, pt-jit.h, pt-misc.h, token.h, CMatrix.cc, CMatrix.h, CSparse.cc, CSparse.h, dMatrix.h, fCMatrix.cc, fCMatrix.h, fMatrix.h, Faddeeva.cc, gepbalance.cc, hess.cc, oct-fftw.cc, oct-fftw.h, file-stat.cc, lo-sysinfo.cc, action-container.h, f77-fcn.h, lo-regexp.cc, oct-mutex.h, oct-shlib.cc: Use Octave coding conventions in C++ files.

--- a/libinterp/corefcn/gl-render.cc	Tue Apr 03 21:48:53 2018 +0200
+++ b/libinterp/corefcn/gl-render.cc	Tue Apr 03 13:52:07 2018 -0700
@@ -1066,8 +1066,8 @@
 
 #else
 
-  // This shouldn't happen because construction of opengl_renderer
-  // objects is supposed to be impossible if OpenGL is not available.
+    // This shouldn't happen because construction of opengl_renderer
+    // objects is supposed to be impossible if OpenGL is not available.
 
     octave_unused_parameter (width);
     octave_unused_parameter (height);
@@ -1217,9 +1217,9 @@
     bool layer2Dtop = props.get_layer2Dtop ();
     bool is2d = props.get_is2D ();
     bool isXOrigin = props.xaxislocation_is ("origin")
-                       && ! props.yscale_is ("log");
+                     && ! props.yscale_is ("log");
     bool isYOrigin = props.yaxislocation_is ("origin")
-                       && ! props.xscale_is ("log");
+                     && ! props.xscale_is ("log");
     bool boxFull = (props.get_boxstyle () == "full");
     double linewidth = props.get_linewidth ();
     double xPlane = props.get_xPlane ();
@@ -1448,8 +1448,7 @@
         double y_axis_pos = 0.;
         if (is_origin)
           {
-            y_axis_pos = math::max (math::min (0., y_max),
-                                            y_min);
+            y_axis_pos = math::max (math::min (0., y_max), y_min);
             glBegin (GL_LINES);
             set_color (props.get_ycolor_rgb ());
             glVertex3d (x_min, y_axis_pos, zpTick);
@@ -1632,8 +1631,7 @@
         double x_axis_pos = 0.;
         if (is_origin)
           {
-            x_axis_pos = math::max (math::min (0., x_max),
-                                            x_min);
+            x_axis_pos = math::max (math::min (0., x_max), x_min);
             glBegin (GL_LINES);
             set_color (props.get_ycolor_rgb ());
             glVertex3d (x_axis_pos, y_min, zpTick);