[O] [Feature request] org-babel-tangle-file add an option to tangle if target-file is older than file.

[Marcin Antczak]

As in topic.
I think that if both parameters 'file' and 'target-file' are set and 
'target-file' exists, 'org-babel-tangle-file' should tangle only if 
'target-file' is older.


Marcin