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/tool_lib.cpp

@@ -118,6 +118,10 @@ void LIB_EDIT_FRAME::ReCreateHToolbar()
     m_mainToolBar->AddTool( ID_LIBEDIT_DELETE_PART, wxEmptyString, KiBitmap( delete_xpm ),
                             _( "Delete component in current library" ) );
 
+    m_mainToolBar->AddSeparator();
+    m_mainToolBar->AddTool( ID_TO_LIBVIEW, wxEmptyString, KiBitmap( library_browse_xpm ),
+                            HELP_RUN_LIB_VIEWER );
+
     m_mainToolBar->AddSeparator();
     m_mainToolBar->AddTool( ID_LIBEDIT_NEW_PART, wxEmptyString, KiBitmap( new_component_xpm ),
                             _( "Create a new component" ) );