We now have real darks, but I'm not sure about the exposure-time coverage of these darks

We have a number of groups of 300s darks followed by a single 1200s dark from 2015-12-0[345]. Also a few 1200s dark pairs and a smaller number of 3600s darks. Look at the LOG.txt files in each of the directories.

Beware of light leaks/stray flux. I'd look carefully at the longest exposure in a group before using anything. Also detector temperatures: several sets were taken during cooldowns and/or warmups.

Essentially nothing physical/electronic was completely stable for very long, so be very careful about, say, merging biases from different groups as seen in the log files.

Per discussion on 2016-07-08, this is done for now; if more simulations are needed later, that's a new ticket.