Run7/step12 additions

[seanmacb]

Adding two stability flat files at 10k e- and 50k e-

The reasoning being to use two different levels. The gain stability has typically used 10k electrons in the center of the field of view and a 2nd, higher light level, at 50k electrons. The reason is that the previous gain stability runs had shown about a 0.06%/C temperature coefficient. But looking at a dense PTC with varying temperature, Eli derived a constant closer to 0.08%/C. Studying that at two different level would help understand that better