[O] Stop conversion of result on serialising to file

[Bjarte Johansen]

When running a source block and storing the result in a file the data will 
first be converted to a table in org-babel-result-cond and then converted back 
to text when org-babel-execute-src-block writes it to file. This is takes a 
very long time when the result is big and it is unnecessary. I have attached a 
patch that makes org-babel-result-cond return the scalar result when it knows 
the result will be turned into a file.

Regards,
Bjarte

0001-ob-core-Do-not-return-results-on-writing-to-file.patch
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