SF feature request #57 - Rewrite PDL/Dataflow.pod

[mohawk2]

https://sourceforge.net/p/pdl/feature-requests/57/

PDL::Dataflow needs to be gone over with a fine-toothed comb. For example, the DESCRIPTION section is just wrong. Probably the rest of the document could be updated for what actually got implemented, not just Tuomas' now 14-year-old vision of what might be done, but wasn't. Dataflow is potentially confusing enough without having an outdated manual.

[mohawk2]

The DESCRIPTION (no dataflow forwards by default but you can turn it on) is not in fact wrong. That behaviour is tested in t/thread.t and has been for many years.

[mohawk2]

And the above-linked commit actually largely rewrites the Dataflow doc in line with the current reality (and a bit of future ideas for event stuff).