Added HPC capability to nlapp

Since nlapp can only run on aeolus (where the AERI linux programs are),
the “hpc” default for the nlapp() function is “True”.  However, if
anyone is ever able to run this on another computer without HPC
capability, they can set hpc = False.

Note that the hpc code spawns off all the processes, then runs the
qsubComplete function and waits until all the processes are finished.
Then it cleans up.