Pull select statement from environment rather than requiring qstat

[benkirk]

Let's work with Altair & HSG to see if we can get a hook in place to export the select statement into an environment variable, then use it if available. Can still fall back to qstat if the magic variable is unset.

[roryck]

That sounds like a good approach to me, the qstat is the most fragile piece of the whole thing

[roryck]

Grabbing the select from the exported ENV VAR now, much cleaner.