contrib: factor out actual error check for file data of check-code.py This is a part of preparation to apply checking with check-code.py on code fragments embedded in *.t test scripts. Newly added _checkfiledata() will be useful to apply checks on code fragments embedded in *.t test scripts.

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Greg Ward, author of the original bfiles extension

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Na'Tosha Bard of Unity Technologies

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Fog Creek Software

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Special thanks to the University of Toronto and the UCOSP program