[O] Setting The Output Directory for Markdown Export.

[Ian Barton]

I want to export a single file to somewhere other than its current 
directory. Using publish seems to be over the top for this simple use case.

I can't find a variable or in buffer option that lets me set the output 
directory. Searching the list turns up org-export-publishing-directory, 
but this seems to have been deprecated. Is there something obvious I 
have missed?

Ian.