Gerbview: export_to_pcbnew enhancement and fixes.

gerbview/CMakeLists.txt

@@ -17,6 +17,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR}
 set(DIALOGS_SRCS
     dialogs/gerbview_dialog_display_options_frame_base.cpp
     dialogs/gerbview_dialog_display_options_frame.cpp
+    dialogs/dialog_layers_select_to_pcb_base.cpp
     dialogs/dialog_print_using_printer.cpp
     dialogs/dialog_print_using_printer_base.cpp
     )

gerbview/class_gerber_draw_item.cpp

@@ -419,7 +419,7 @@ void GERBER_DRAW_ITEM::Draw( EDA_DRAW_PANEL* aPanel, wxDC* aDC, int aDrawMode,
         break;
 
     case GBR_ARC:
-        // Currently, arcs plotted witha rectangular aperture are not supported.
+        // Currently, arcs plotted with a rectangular aperture are not supported.
         // a round pen only is expected.
 #if 0     // for arc debug only
         GRLine( &aPanel->m_ClipBox, aDC, GetABPosition( m_Start ),