[FIX] Adding virtual constructor to base test class Test.

Identified by Coverity.
[FIX] Fixing various issues.

* initialization
* bracket position
[FIX] Fixes to more issues.

Found by Coverity, most are uninitialized memory problems.
[FIX] fixed sam/bam tutorials in extras
[FIX] ported former SequenceStream tutorials
[FIX] fixed former BedStream tutorials
[FIX] fixed rep_sep
Merge branch 'develop' of github.com:seqan/seqan into feature/stream-fixes
[FIX] fixed qual2prob
[FIX] Yara: used C++11 thread instead of Thread class
Merge pull request #609 from esiragusa/fix/yara/prefetch

[FIX] Yara: fixed random aborts
[INTERNAL] Removing test_stream_bgzf.h.
[FIX] Fixing resource leak in tests system.

Leak was not critical, occurred at the end of a test suite run.
Merge pull request #611 from holtgrewe/fix/test-system-dir-resource-leak

[FIX] Fixing resource leak in tests system.
[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.
[FIX] Removing tentative div-by-0 error in alignment_free.
Merge pull request #613 from holtgrewe/fix/alignment-free-div-by-0

[FIX] Removing tentative div-by-0 error in alignment_free.
[FIX] minor fixes
[FIX] first parsing tut converted