Exporting master-child documents as plain text

[Andrew Parsloe]

I've been exporting LyX docs to plain text recently & the occasion arose 
to export a master document as plain text. The master exported as 
expected but the child docs didn't. The plain text master simply 
includes messages like

[Include: newfile2.lyx]
I suspect that plain text may have slipped under the radar in the work 
on master-child docs. Certainly for what I'm doing, it would be good to 
have the child also exported (unless of course the Include is turned off).

Andrew