Merge pull request seqan#449 from holtgrewe/feature/gustaf_1_0_0

[FEATURE] Some adjustments for Gustaf.

Merge pull request seqan#418 from holtgrewe/hotfix/app_tests_normaliz…

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[HOTFIX] Normalizing line endings by default in app tests. (master)

[FIX] disabled OpenMP warnings for travis and clang

[FIX] hotfix for stree iterators on empty string sets