SGP/MFRSR/E3 - 940 channel noisy, intermittent

Channel 940 drops out or is noisy at times.  First noticed on 24 Aug 2006, it is "dead" 
until 20 Sept 2006.  Other dates where problems are noted:

30 Jan 2007 - 2 Feb 2007
1 April 2007 
12 Aug 2007 - current

There could be other times when 940 was exhibiting problems that were not caught by the 
mentor, so this DQR is being written to cover the entire period.

Screen 940 data for periods when it may not be functioning properly

• number of points used in final linear fit for the Direct Narrowband Filter6(michalsky_number_points_filter6)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter6(barnard_good_fraction_filter6)
• rejection flag for Direct Narrowband Filter6(michalsky_badflag_filter6)
• rejection flag for Direct Narrowband Filter6(barnard_badflag_filter6)
• solar constant corrected for solar distance for the Direct Narrowband Filter6(barnard_solar_constant_sdist_filter6)
• optical depth for the Direct Narrowband Filter6(michalsky_optical_depth_filter6)
• optical depth for the Direct Narrowband Filter6(barnard_optical_depth_filter6)
• error in final linear fit for the Direct Narrowband Filter6(barnard_error_fit_filter6)
• error in optical depth (slope) of final linear fit for the Direct Narrowband
  Filter6(barnard_error_slope_filter6)
• solar constant corrected for solar distance for the Direct Narrowband Filter6(michalsky_solar_constant_sdist_filter6)
• percentage of initial points used in final linear fit for the Direct Narrowband
  Filter6(michalsky_good_fraction_filter6)
• number of points used in final linear fit for the Direct Narrowband Filter6(barnard_number_points_filter6)
• standard deviation around regression line for the Direct Narrowband Filter6(michalsky_standard_deviation_filter6)
• solar constant for the Direct Narrowband Filter6(michalsky_solar_constant_filter6)

• rejected points for the final fit for the Direct Narrowband Filter6(barnard_rejected_filter6)
• rejected points for the final fit for the Direct Narrowband Filter6, Michalsky(michalsky_rejected_filter6)
• log(irradiance) for the Direct Narrowband Filter6, Michalsky(michalsky_lnI_filter6)
• log(irradiance) for the Direct Narrowband Filter6(barnard_lnI_filter6)

• Diffuse Narrowband Hemispheric Irradiance, Filter 6, offset corrected(diffuse_hemisp_narrowband_filter6)
• Narrowband hemispheric irradiance, filter 6, nominal wavelength is 935 nm(hemisp_narrowband_filter6)
• Narrowband Direct Horizontal Irradiance, Filter 6, cosine corrected(direct_horizontal_narrowband_filter6)

• Diffuse Narrowband Hemispheric Irradiance, Filter 6, offset corrected(diffuse_hemisp_narrowband_filter6)
• Narrowband hemispheric irradiance, filter 6, nominal wavelength is 935 nm(hemisp_narrowband_filter6)
• Direct normal narrowband irradiance, filter 6, offset corrected(direct_normal_narrowband_filter6)
• Narrowband Direct Horizontal Irradiance, Filter 6, cosine corrected(direct_horizontal_narrowband_filter6)