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/quadcc.cc	Mon Nov 07 15:48:46 2016 -0800
+++ b/libinterp/corefcn/quadcc.cc	Tue Nov 08 10:01:17 2016 -0800
@@ -2211,7 +2211,7 @@
 %! assert (q, 0, 1e-6);
 %! assert (err, 0, 15*eps);
 
-%% Test input validation
+## Test input validation
 %!error (quadcc ())
 %!error (quadcc (@sin))
 %!error (quadcc (@sin, 0))