Feature Request: Special input value to create a barrier

[Achim Gratz]

I could use a (configurable) special input value that creates a barrier
(i.e. wait for all previous jobs to finish) upon parallel encountering
it.  Usage would be something like:

parallel --barrier + do_something '{}' ::: job1 job2 job3 + job4 job5 + job6 
job7

which should start the first three jobs, wait for them to finish, then
starts the fourth and fifth job, waits again for these to finish, then
the remaining sixth and seventh job are started in parallel.


Regards,
Achim.
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