writing directory with autoconversion

[SylvainTakerkart]

Hi @JuliaSprenger ,

I've just realized something... When the autoconversion is on, the file is first converted and written in the input directory before being renamed/moved to the output directory... However, I can see some cases where the input directory could be read-only, so the temporary file should not be written in the input directory...

Do you agree? If yes, we should fix this! (this can be done later...)