avoid dependency tests being marked as risky

adjust tests to make use of new DOKU_HAS_*ZIP defines

Deleting lines works with BZ2 files.

correct error checking for bz2 file reading

The code reading .bz2 compressed files did not correctly check for
possible read errors. In case of a corrupted file this could have led to
an infinite lo

correct error checking for bz2 file reading

The code reading .bz2 compressed files did not correctly check for
possible read errors. In case of a corrupted file this could have led to
an infinite loop.

Thanks to Filippo Cavallarin from www.segment.technology for dicovering
this bug.

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