[FEATURE] Splitting main/dependency headers for SeqAn.
Merge branch 'develop' of github.com:seqan/seqan into features/find-seqan-split-includes
Merge branch 'develop' of https://github.com/holtgrewe/seqan into features/find-seqan-split-includes
Merge pull request #571 from holtgrewe/features/find-seqan-split-includes

[FEATURE] Splitting main/dependency headers for SeqAn.