Physical printers: Implemented import/export to/from the ConfigBundle.

+ fixed a bug : Case sensitivity of printer's name wasn't check during the adding of a new printer,
as a result in printers list was appeared both of printers (ex. "YuSanka" and "yusanka"), but related file was just one.

src/slic3r/GUI/MainFrame.hpp

@@ -180,7 +180,7 @@ public:
     void        load_config_file();
     // Open a config file. Return true if loaded.
     bool        load_config_file(const std::string &path);
-    void        export_configbundle();
+    void        export_configbundle(bool export_physical_printers = false);
     void        load_configbundle(wxString file = wxEmptyString);
     void        load_config(const DynamicPrintConfig& config);
     // Select tab in m_tabpanel