strip trailing whitespace from most source files * NEWS, etc/NEWS.3, libgui/graphics/Backend.h, libgui/graphics/ButtonControl.h, libgui/graphics/EditControl.cc, libgui/graphics/Object.h, libgui/graphics/QtHandlesUtils.cc, libgui/graphics/ToolBarButton.h, libgui/graphics/__init_qt__.cc, libgui/graphics/gl-select.cc, libgui/qterminal/libqterminal/unix/TerminalView.cpp, libgui/qterminal/libqterminal/unix/TerminalView.h, libgui/qterminal/libqterminal/win32/QWinTerminalImpl.cpp, libgui/src/m-editor/file-editor-tab.cc, libgui/src/m-editor/file-editor.cc, libgui/src/m-editor/file-editor.h, libgui/src/m-editor/octave-qscintilla.cc, libgui/src/settings-dialog.cc, libgui/src/shortcut-manager.cc, libgui/src/workspace-view.cc, libinterp/corefcn/graphics.cc, libinterp/corefcn/input.cc, libinterp/parse-tree/pt-unop.cc, liboctave/array/dSparse.h, scripts/pkg/pkg.m, scripts/polynomial/polyeig.m, test/io.tst: Strip trailing whitespace.

--- a/libinterp/corefcn/input.cc	Tue Jan 20 10:05:42 2015 -0500
+++ b/libinterp/corefcn/input.cc	Tue Jan 20 09:43:29 2015 -0500
@@ -184,7 +184,7 @@
   eof = false;
 
   std::string retval = command_editor::readline (s, eof);
-  
+
   if (! eof && retval.empty ())
     retval = "\n";
 
@@ -513,7 +513,7 @@
 
   bool silent = tree_evaluator::quiet_breakpoint_flag;
   tree_evaluator::quiet_breakpoint_flag = false;
-          
+
   octave_user_code *caller = octave_call_stack::caller_user_code ();
   std::string nm;
   int curr_debug_line;
@@ -581,7 +581,7 @@
 
   if (silent)
     command_editor::erase_empty_line (true);
-  
+
   std::string msg = buf.str ();
 
   if (! msg.empty ())