Incorporate simulated flux standard spectra

In SIM2D-150, Takuji Yamashita provides simulated flux standard spectra. These need to be copied into our simulator spectral library, and the necessary hooks added in order to use them. The pfsDesign files need to be updated to point to the new spectra.

While I'm updating the pfsDesign files, I've noticed that the pair of science observation pfsDesign files are identical; they should have the fibers shuffled so we're not repeating the same thing.

Once everything is ready, generate a new set of integration test and weekly simulated data for Takuji Yamashita to use in testing the flux calibration code.