Allow for the parallel simulation and comparison of trjs with unique initial conditions.

Updating my branch.  I know I will need to change some networkx stuff, and I think the result file compression handling has changed.  This will impact how the parallel trajectory pickles are recombined.

I also added an isothermal compressibility target a few months ago - it's useless (for now) as the needed sampling is on the order of 100 ns.
Well the original kappa calculation doesn't make sense for a bilayer (volume fluctuations aren't significant because of the water/separate pressure coupling).  Should I take out the other unnecessary property calculations?  Almost all of the other properties (density, thermal expansion coefficients, etc.) are calculated differently for bilayers...