DIV files with different attenuation

[srkline]

from Cedric:

recently (Jan 2016) plex data was collected with 0 or 1 attenuator, both in centered and offset conditions. when reducing, the "block" in the middle was grossly offset from the rest of the detector value. When 1 atten data was used for both configs, the offset was worse than for one offset only. Either way, it's incorrect.

Need to allow, and properly add plea data with attenuation

Get example data from Cedric to verify the problem and solution