Fix @JP messages (no bugs, just comment lines)

Eeschema: Viewlib is now accessible from Libedit (to browse libs or load a component to edit)
Libedit: uses now the same dialog as the schematic editor to load a component
Some code cleaning.

eeschema/viewlib_frame.cpp

@@ -255,7 +255,7 @@ LIB_VIEW_FRAME::LIB_VIEW_FRAME( wxWindow* father, CMP_LIBRARY* Library, wxSemaph
 
 LIB_VIEW_FRAME::~LIB_VIEW_FRAME()
 {
-    SCH_EDIT_FRAME* frame = (SCH_EDIT_FRAME*) wxGetApp().GetTopWindow();
+    SCH_BASE_FRAME* frame = (SCH_BASE_FRAME*) GetParent();
     frame->SetLibraryViewerWindow( NULL );
 }