[ESS] Interactive SAS mode hangs

[Sparapani, Rodney]

> What is the difference between ess-sas-interactive and M-x SAS? It seems like maybe when I run SAS via the
> latter process, ESS hangs every time I get an error message back from SAS or something. That's obviously
> not desired behavior in and of itself. Not being able to get through a datastep even when the hanging is not
> happening (i.e. in ess-sas-interactive) is also a problem, but might be a separate problem.
> 
> Erin

There are some subtle differences.  Mainly, M-x ess-sas-interactive
just tests all of the functionality needed to run M-x SAS.  If 
ess-sas-interactive works, then you know that something is wrong
with your setup rather than ESS itself.