Changed some strategy in autosaving feature.
1) Initially, autosaved file was visible. Now. it will have a front dot along with the filename to make it invisible.
2) If we dont have the filename for autosaving, it will take the default name (i.e. ".Temp.khipu.autosave").
In other cases, it will be saved with the name ".filename.khipu.autosave" , in the same directory where the actual file is.