1) Expand the isartor test code so that it can also check conforming documents, i.e. documents that should not bring any errors. Support JBIG2.
2) Test the files from the Bavaria suite with preflight. I'll create sub-issues on that one. I counted 16 where something doesn't work as intented.
3) Include the Bavaria tests in the build. Only if we agree on this one. If not, I'll just keep it for myself as an additional regression test.