maint: Clean up code base to follow Octave coding conventions. Space between '!' and expression that follows. Eliminate whitespace at end of line. Use '#' rather than '%' for comment character. * ButtonGroup.cc, ListBoxControl.cc, file-editor-tab.cc, file-editor.cc, bsxfun.cc, cellfun.cc, conv2.cc, data.cc, dot.cc, fft2.cc, file-io.cc, filter.cc, graphics.cc, kron.cc, oct-stream.cc, quadcc.cc, spparms.cc, sylvester.cc, convhulln.cc, qr.cc, ov-class.cc, ov-cx-mat.cc, ov-usr-fcn.cc, pt.h, Array.cc, gsvd.h, inputdlg.m, krylov.m, shrinkfaces.m, padecoef.m, polyout.m, durbinlevinson.m: maint: Clean up code base to follow Octave coding conventions.

--- a/libgui/graphics/ButtonGroup.cc	Mon Nov 07 15:48:46 2016 -0800
+++ b/libgui/graphics/ButtonGroup.cc	Tue Nov 08 10:01:17 2016 -0800
@@ -443,7 +443,7 @@
   ButtonGroup::buttonToggled (bool toggled)
   {
     Q_UNUSED (toggled);
-    if (!m_blockUpdates)
+    if (! m_blockUpdates)
       {
         gh_manager::auto_lock lock;
         uibuttongroup::properties& bp = properties<uibuttongroup> ();