regression_dataflow_791 needs to be brought in line with HPX standards

[brycelelbach]

This test has the following issues:

• Uses atoi/argc/argv for command line processing instead of utilizing boost::program_options.
• Uses printf instead of C++ iostreams (actually, since it's a test, it shouldn't really do any output

[hkaiser]

Why is that an requirement? That is a concrete user program somebody contributed as it was helping to fix a bug. I tend to leave it as it is.

[brycelelbach]

Programs should use program_options for usability. boost::program_options ensures that we have --help, etc.

I think we can all agree on the printf issue.

[sithhell]

Is this still a problem?

[sithhell]

Closing this as "won't fix" due to missing input.