In the original version, parsing and comparing output was
done in separate test methods. This was forbidding use of
QTest cleanup to call clear_dive_file_data().
As a side effect a failure in one test would make other tests
failing too (since call to clear_dive_file_data was skipped
by QCOMPARE failure).
Added a FILE_COMPARE macro to avoid code duplication.
Signed-off-by: Jeremie Guichard <djebrest@gmail.com>