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-O3 -march=native seems to make no performance difference (and actually
slows some parts of eris down--plus seems to introduce
non-reproducibility in RNG when -march=native enables AVX instructions)

The threading overhead and locking seems to make threaded runs slower,
so default to no threads.

Leaving the cursor hidden after a Ctrl-C aborting a simulation run was
really annoying.

These were still erroneously being predeclared in some eris header,
which is why this wasn't caught before.  That got fixed in eris, and
needs to be fixed here, too.

add_definitions() was being misused instead.

- Optimizer overhaul (gets rid of PartyMover in favour of having parties
  register themselves as interoptimizers and handle movement themselves).
- Eris interface change, getting rid of seperate createThis, createThat
  in favour of a single create<...> method.
- Got rid of short-lived (now removed) simulation->threadModel
- Locate eris via a symlink rather than looking at ../eris
- Updated for PositionalAgent interface change (no longer accepting
  double arguments, instead requiring Position-convertible arguments
  such as initializer_list<double>s).
- Added --skip-file option to skip creating a results file

clang-3.2 (which is the latest in Ubuntu 13.04, the latest release as of
this writing) doesn't support inherited constructors (it was added in
clang-3.3).

Replaced enums with strongly typed enums, catching (and fixing) the bug
that caused "beta55" to always be used for output, regardless of what
the actual distribution used was.  (This happened because `int ==
enumval' was allowed, but shouldn't have been)

FPTP = First Past The Post