bugfix: fix incorrect formatting in urljoin
bugfix: fix bytes/str in 'ddfs cat' for python3.
Add some info on make-discoproject-debian script to docs.
Fix input extraction from jobpack.
Merge branch 'master' into devel/scheduler
Make input label explicit in worker protocol instead of using url fragments; use 'all' to denote all labels.
Update core library task and worker for pipeline task model.
Update classic worker for pipeline task model.