Refactors to parun, NumericalSolution, Profiling

* Remove some dead code
* Refactor profiling calls into dispatcher
* Add ability to just set up the Numerical Solution without calling Solver
I catch the error and report the code because the integer error codes actually matter to  us: http://wias-berlin.de/software/tetgen/1.5/doc/manual/manual009.html. I'm OK with this if check_call reports enough information.