Update README.md
Added MPFIT details
@@ -119,6 +119,7 @@ Poser | [poser_octavioradii.c](src/poser_octavioradii.c) | A potentially very fa
Poser | [poser_turveytori.c](src/poser_turveytori.c) | A moderately fast, fairly high precision poser that works by determine the angle at the lighthouse between many sets of two sensors. Using the inscirbed angle theorom, each set defines a torus of possible locations of the lighthouse. Multiple sets define multiple tori, and this poser finds most likely location of the lighthouse using least-squares distance. Best suited for calibration, but is can be used for real-time tracking on a powerful system. | [@mwturvey](https://github.com/mwturvey)
Poser | [poser_epnp.c](src/poser_epnp.c) | Reasonably fast and accurate calibration and tracker that uses the [EPNP algorithm](https://en.wikipedia.org/wiki/Perspective-n-Point#EPnP) to solve the perspective and points problem. Suitable for fast tracking, but does best with >5-6 sensor readings. | [@jdavidberger](https://github.com/jdavidberger)
Poser | [poser_sba.c](src/poser_sba.c) (default) | Reasonably fast and accurate calibration and tracker but is dependent on a 'seed' poser to give it an initial estimate. This then performs [bundle adjustment](https://en.wikipedia.org/wiki/Bundle_adjustment) to minimize reprojection error given both ligthhouse readings. This has the benefit of greatly increasing accuracy by incorporating all the light data that is available. Set 'SBASeedPoser' config option to specify the seed poser; default is EPNP. | [@jdavidberger](https://github.com/jdavidberger)
+Poser | [poser_mpfit.c](src/poser_mpfit.c) | Performs Levenberg-Marquardt using [MPFIT](https://www.physics.wisc.edu/~craigm/idl/cmpfit.html). Since SBA does basically the same thing, this poser gets nearly identical results to SBA. Overall it is a tad slower than SBA since SBA uses optimized lapack functions to solve Ax=b, but MPFIT has the distinction of not needing lapack at all since it's Ax=b solver is a minimal internal version. It also requires a seed poser. | [@jdavidberger](https://github.com/jdavidberger)
Disambiguator | [survive_data.c](src/survive_charlesbiguator.c) | The old disambiguator - very fast, but slightly buggy. | [@cnlohr](https://github.com/cnlohr)
Disambiguator | [survive_data.c](src/survive_turveybiguator.c) (default) | More complicated but much more robust disambiguator | [@mwturvey](https://github.com/mwturvey)
Disambiguator | [survive_data.c](src/survive_statebased_disambiguator.c) | A fast disambiguator that was times the state shifts between pulses. Experimental. Made to allow tracking very close to the lighthouse | [@jdavidberger](https://github.com/jdavidberger)
