Rename the DKFZ workflow directory to better reflect the workflows content.

Fill the readme with some basic information.
Fix some bugs in the dkfz workflow. Also generify methods to decrease code duplicity and complexity.
Add missing files.
A lot of changes and bugfixes.
GNOS download now only starts if no checkpoint file exists (checkpoint.txt file within the download dir).
All three Roddy pipelines are now started. By default a premade delly file is used for aceseq.
Merge branch 'develop' of https://github.com/SeqWare/public-workflows into develop