Auto-install on import, if NavServices is available. Unless a "no navservices"…

Auto-install on import, if NavServices is available. Unless a "no navservices" flag is set Python automagically imports this module so code that uses macfs.xxxGetFile will get NavServices dialogs.

Mac/Lib/macfsn.py

@@ -129,6 +129,7 @@ if Nav and Nav.NavServicesAvailable():
 	StandardPutFile = _StandardPutFile
 	SetFolder = _SetFolder
 	GetDirectory = _GetDirectory
+	_install()
 else:
 	from macfs import StandardGetFile, PromptGetFile, StandardPutFile, SetFolder, GetDirectory