Modular KiCad Blueprint Milestone B), major portions:

*) When kicad.exe closes a project, close any open KIFACEs so that they cannot
     get disassociated from their true PROJECT.
  *) Allow loading eeschema library editor from kicad.exe
  *) Allow loading pcbnew library editor from kicad.exe
  *) Rename LIB_COMPONENT to LIB_PART.
  *) Add class PART_LIBS, and PART_LIB.
  *) Make PART_LIBS non-global, i.e. PROJECT specific.
  *) Implement "data on demand" for PART_LIBS
  *) Implement "data on demand" for schematic SEARCH_STACK.
  *) Use RSTRINGs to retain eeschema editor's notion of last library and part being edited.
  *) Get rid of library search on every SCH_COMPONENT::Draw() call, instead use
     a weak pointer.
  *) Remove all chdir() calls so projects don't need to be CWD.
  *) Romove APPEND support from OpenProjectFiles().
  *) Make OpenProjectFiles() robust, even for creating new projects.
  *) Load EESCHEMA colors in the KIWAY::OnKiwayStart() rather in window open,
     and save them in the .eeschema config file, not in the project file.
  *) Fix bug with wxDir() while accessing protected dirs in kicad.exe
  *) Consolidate template copying into PROJECT class, not in kicad.exe source.
  *) Generally untangle eeschema, making its libraries not global but rather
     held in the PROJECT.

eeschema/libedit_plot_component.cpp

@@ -46,12 +46,13 @@
 
 void LIB_EDIT_FRAME::OnPlotCurrentComponent( wxCommandEvent& event )
 {
-    LIB_COMPONENT* cmp = GetComponent();
-    wxString   FullFileName;
+    wxString   fullFileName;
     wxString   file_ext;
     wxString   mask;
 
-    if( cmp == NULL )
+    LIB_PART*      part = GetCurPart();
+
+    if( !part )
     {
         wxMessageBox( _( "No component" ) );
         return;
@@ -65,20 +66,22 @@ void LIB_EDIT_FRAME::OnPlotCurrentComponent( wxCommandEvent& event )
 
             file_ext = fmt_is_jpeg ? wxT( "jpg" ) : wxT( "png" );
             mask     = wxT( "*." ) + file_ext;
-            wxFileName fn( cmp->GetName() );
+            wxFileName fn( part->GetName() );
             fn.SetExt( file_ext );
 
-            FullFileName = EDA_FileSelector( _( "Filename:" ), wxGetCwd(),
+            wxString pro_dir = wxPathOnly( Prj().GetProjectFullName() );
+
+            fullFileName = EDA_FileSelector( _( "Filename:" ), pro_dir,
                                              fn.GetFullName(), file_ext, mask, this,
                                              wxFD_SAVE, true );
 
-            if( FullFileName.IsEmpty() )
+            if( fullFileName.IsEmpty() )
                 return;
 
             // calling wxYield is mandatory under Linux, after closing the file selector dialog
             // to refresh the screen before creating the PNG or JPEG image from screen
             wxYield();
-            CreatePNGorJPEGFile( FullFileName, fmt_is_jpeg );
+            CreatePNGorJPEGFile( fullFileName, fmt_is_jpeg );
         }
         break;
 
@@ -86,26 +89,29 @@ void LIB_EDIT_FRAME::OnPlotCurrentComponent( wxCommandEvent& event )
         {
             file_ext = wxT( "svg" );
             mask     = wxT( "*." ) + file_ext;
-            wxFileName fn( cmp->GetName() );
+            wxFileName fn( part->GetName() );
             fn.SetExt( file_ext );
-            FullFileName = EDA_FileSelector( _( "Filename:" ), wxGetCwd(),
+
+            wxString pro_dir = wxPathOnly( Prj().GetProjectFullName() );
+
+            fullFileName = EDA_FileSelector( _( "Filename:" ), pro_dir,
                                              fn.GetFullName(), file_ext, mask, this,
                                              wxFD_SAVE, true );
 
-            if( FullFileName.IsEmpty() )
+            if( fullFileName.IsEmpty() )
                 return;
 
             PAGE_INFO pageSave = GetScreen()->GetPageSettings();
             PAGE_INFO pageTemp = pageSave;
 
-            wxSize componentSize = m_component->GetBoundingBox( m_unit, m_convert ).GetSize();
+            wxSize componentSize = part->GetBoundingBox( m_unit, m_convert ).GetSize();
 
             // Add a small margin to the plot bounding box
             pageTemp.SetWidthMils(  int( componentSize.x * 1.2 ) );
             pageTemp.SetHeightMils( int( componentSize.y * 1.2 ) );
 
             GetScreen()->SetPageSettings( pageTemp );
-            SVG_PlotComponent( FullFileName );
+            SVG_PlotComponent( fullFileName );
             GetScreen()->SetPageSettings( pageSave );
         }
         break;
@@ -165,18 +171,20 @@ void LIB_EDIT_FRAME::SVG_PlotComponent( const wxString& aFullFileName )
 
     plotter->StartPlot();
 
-    if( m_component )
+    LIB_PART*      part = GetCurPart();
+
+    if( part )
     {
-        TRANSFORM temp;     // Uses default transform
-        wxPoint plotPos;
+        TRANSFORM   temp;     // Uses default transform
+        wxPoint     plotPos;
+
         plotPos.x = pageInfo.GetWidthIU() /2;
         plotPos.y = pageInfo.GetHeightIU()/2;
 
-        m_component->Plot( plotter, GetUnit(), GetConvert(), plotPos, temp );
+        part->Plot( plotter, GetUnit(), GetConvert(), plotPos, temp );
 
         // Plot lib fields, not plotted by m_component->Plot():
-        m_component->PlotLibFields( plotter, GetUnit(), GetConvert(),
-                                    plotPos, temp );
+        part->PlotLibFields( plotter, GetUnit(), GetConvert(), plotPos, temp );
     }
 
     plotter->EndPlot();
@@ -185,7 +193,9 @@ void LIB_EDIT_FRAME::SVG_PlotComponent( const wxString& aFullFileName )
 
 void LIB_EDIT_FRAME::PrintPage( wxDC* aDC, LSET aPrintMask, bool aPrintMirrorMode, void* aData)
 {
-    if( ! m_component )
+    LIB_PART*      part = GetCurPart();
+
+    if( !part )
         return;
 
     wxSize pagesize = GetScreen()->GetPageSettings().GetSizeIU();
@@ -198,7 +208,7 @@ void LIB_EDIT_FRAME::PrintPage( wxDC* aDC, LSET aPrintMask, bool aPrintMirrorMod
     plot_offset.x = pagesize.x/2;
     plot_offset.y = pagesize.y/2;
 
-    m_component->Draw( m_canvas, aDC, plot_offset, m_unit, m_convert, GR_DEFAULT_DRAWMODE );
+    part->Draw( m_canvas, aDC, plot_offset, m_unit, m_convert, GR_DEFAULT_DRAWMODE );
 }