[INTERNAL] Removing test_stream_bgzf.h.
[FIX] Using maxValue<>() explicitely in Fiona.

Coverity had a false positive here since the value is never used, but
it does not hurt to use maxValue<unsigned>() explicitely here, either.
[FIX] Preventing possible div-by-0 in fiona.
Merge pull request #614 from weese/feature/stream-fixes

[FIX] ported more parsing tutorials
Merge pull request #612 from holtgrewe/fix/fiona-uninitialized-value

[FIX] Using maxValue<>() explicitely in Fiona.
Merge pull request #610 from holtgrewe/feature/remove-test-stream-bgzf-h

[INTERNAL] Removing test_stream_bgzf.h.