Instead of specifying the loggp config file path relative to the
path of the respective executable file, you now must specify it
relative to the path of the master config file.

This prevents simulations that run for a certain duration from
crashing rather than ending when simulation time is reached.

minor changes to model-net plug-in: (1) making the torus network's chunk size configurable (2) handling some edge cases which we haven't encountered so far but its good to have them for future

- these calls should be made by the top level model only, so that all
  results are consolidated into the same subdirectory
- add corresponding calls to modelnet test programs

- save previous cumulative time values rather than actually reversing
  calculation in order to avoid minor discrepancies introduced by
  rounding error

- not producing correct results yet

- also tweak temporary hard-coded network parameters in loggp method to
  look somewhat like Tukey IB network for quick sanity checking of
  output

- right now this runs out of event memory when you run it

- just a slightly modified copy of normal modelnet test for now; will
  update to use as the primary test harness for loggp validation

also misc update to how loggp method plugs into modelnet

- just a copy of simplenet with variables and functions renamed for now

Adding statistics collection using lp-io in model-net API (comes from the simple-net stats collection), works for simple-net, torus and the dragonfly network models (updating comments)

Adding statistics collection using lp-io in model-net API (comes from the simple-net stats collection), works for simple-net, torus and the dragonfly network models