Eeschema: silently save project file after schematic plot setting changes.

Don't prompt the user to save the project file after the schematic plot
settings change.  It is not done this way anywhere else in KiCad.

Fixes lp:1478131

https://bugs.launchpad.net/kicad/+bug/1478131

eeschema/dialogs/dialog_plot_schematic.cpp

@@ -6,9 +6,9 @@
  *
  * Copyright (C) 1992-2015 Jean-Pierre Charras jp.charras at wanadoo.fr
  * Copyright (C) 1992-2010 Lorenzo Marcantonio
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
+ * Copyright (C) 2011 Wayne Stambaugh <stambaughw@gmail.com>
  *
- * Copyright (C) 1992-2015 KiCad Developers, see change_log.txt for contributors.
+ * Copyright (C) 1992-2017 KiCad Developers, see change_log.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -62,7 +62,7 @@ void SCH_EDIT_FRAME::PlotSchematic( wxCommandEvent& event )
 
     // save project config if the prj config has changed:
     if( dlg.PrjConfigChanged() )
-        SaveProjectSettings( true );
+        SaveProjectSettings( false );
 }
 
 
@@ -80,7 +80,6 @@ DIALOG_PLOT_SCHEMATIC::DIALOG_PLOT_SCHEMATIC( SCH_EDIT_FRAME* parent ) :
 }
 
 
-
 // Initialize the dialog options:
 void DIALOG_PLOT_SCHEMATIC::initDlg()
 {
@@ -157,8 +156,10 @@ void DIALOG_PLOT_SCHEMATIC::initDlg()
     OnPlotFormatSelection( cmd_event );
 }
 
-/*
- * TODO: Copy of DIALOG_PLOT::OnOutputDirectoryBrowseClicked in dialog_plot.cpp, maybe merge to a common method.
+
+/**
+ * @todo Copy of DIALOG_PLOT::OnOutputDirectoryBrowseClicked in dialog_plot.cpp, maybe merge to
+ *       a common method.
  */
 void DIALOG_PLOT_SCHEMATIC::OnOutputDirectoryBrowseClicked( wxCommandEvent& event )
 {
@@ -189,13 +190,14 @@ void DIALOG_PLOT_SCHEMATIC::OnOutputDirectoryBrowseClicked( wxCommandEvent& even
     if( dialog.ShowModal() == wxID_YES )
     {
         if( !dirName.MakeRelativeTo( defaultPath ) )
-            wxMessageBox( _( "Cannot make path relative (target volume different from file volume)!" ),
-                          _( "Plot Output Directory" ), wxOK | wxICON_ERROR );
+            wxMessageBox( _( "Cannot make path relative (target volume different from file "
+                             "volume)!" ), _( "Plot Output Directory" ), wxOK | wxICON_ERROR );
     }
 
     m_outputDirectoryName->SetValue( dirName.GetFullPath() );
 }
 
+
 PlotFormat DIALOG_PLOT_SCHEMATIC::GetPlotFileFormat()
 {
     switch( m_plotFormatOpt->GetSelection() )
@@ -224,6 +226,7 @@ void DIALOG_PLOT_SCHEMATIC::getPlotOptions()
     m_config->Write( PLOT_HPGL_ORIGIN_KEY, GetPlotOriginCenter() );
     m_HPGLPaperSizeSelect = m_HPGLPaperSizeOption->GetSelection();
     m_config->Write( PLOT_HPGL_PAPERSIZE_KEY, m_HPGLPaperSizeSelect );
+
     // HPGL Pen Size is stored in mm in config
     m_config->Write( PLOT_HPGL_PEN_SIZE_KEY, m_HPGLPenSize/IU_PER_MM );
 
@@ -238,7 +241,6 @@ void DIALOG_PLOT_SCHEMATIC::getPlotOptions()
         m_configChanged = true;
 
     m_parent->SetPlotDirectoryName( path );
-
 }
 
 
@@ -331,6 +333,7 @@ void DIALOG_PLOT_SCHEMATIC::PlotSchematic( bool aPlotAll )
     }
 }
 
+
 wxFileName DIALOG_PLOT_SCHEMATIC::createPlotFileName( wxTextCtrl* aOutputDirectoryName,
                                                       wxString& aPlotFileName,
                                                       wxString& aExtension,