Improve the photometric quality of intensity maps.

[cmillion]

And test. To match the methodology of the original mission pipeline and correct account for spatial variation in effect exposure time, the counts should be weighted by the effective exposure time in 1 second bins. An initial test of this method produced aperture photometry on a test star that was well within the error bars of the MCAT. This depends on the implementation of #249 in order to run on human timescales.