twelve catalogs, LRGs

I started making the 12 catalogs in the new regime, in which we split the USNO-B1.0 catalog into twelve separate catalogs, each of which does 1/12 of the sky. This allows us to operate with less RAM (but requires us to run simultaneously on more CPUs).

I wrote a few words for Morad's nearly-done paper on LRG clustering at very small scales.