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/libinterp/corefcn/kron.cc	Mon Nov 07 15:48:46 2016 -0800
+++ b/libinterp/corefcn/kron.cc	Tue Nov 08 10:01:17 2016 -0800
@@ -311,9 +311,8 @@
 
 %!assert (kron (diag ([1, 2]), diag ([3, 4])), diag ([3, 4, 6, 8]))
 
-%% Test for two diag matrices.  See the comments above in
-%% dispatch_kron for this case.
-%%
+## Test for two diag matrices.
+## See the comments above in dispatch_kron for this case.
 %!test
 %! expected = zeros (16, 16);
 %! expected (1, 11) = 3;