
2010.07.15

various psphot issues that need to be addressed:

* update extNsigma based on kron mags 
* convert EXT sigmas to a probability (watch that extNsigma is correctly defined)
* psphot forced fails for negative flux
  - do a run, plot a histogram of fluxes as various steps

* capability to choose extended source fits based on |b|
* update psf-convolved fitting to work with sersic (iteration)
