Moved CSV creation to a function. Header creation and data echo will only happen if the $copyfunction variable is not set (by default its not set). This will allow including the file with out triggering it to send the data to the browser.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey@8592 b72ed6b6-b9f8-46b5-92b4-906544132732