Ql countqas

[gdhungana]

This PR addresses the issues #580 and #582 . The new format for the metrics block on those QAs are

• Count Pix: {'LITFRAC_AMP': [0.35, 0.37, 0.33, 0.35],
  'LITFRAC_STATUS': 'NORMAL',
  'NPIX_AMP': [1468029, 1555863, 1410426, 1488293]}

• Count Bins: {'GOOD_FIBER': [1, 1, 1....,1, 1], 'NGOODFIB': 500,
  'NGOODFIB_STATUS': 'NORMAL'}

• This also updates the respective tests and static plots to address new (and single) thresholds and relevant keys.

@rkehoe @Srheft Please review when you get a chance. Let me know if this meets the requirements of those issues.

[Srheft]

LITFRAC_AMP is the fraction of each amp that is illuminated.
NPIX_AMP: number of pixels per amp (>5sigma) seems to not have much use as the illuminated fraction does the critical check. I'd vote for removing them unless another more informative quantity could be derived from them.
Note that the configuration files on github are updated to accommodate the new check HDU in the branch called "ql_HDUsnMore".

[rkehoe]

@Srheft Thanks for the comment. I think NPIX_AMP is fairly superfluous and harder to interpret than the new scalar metric LITFRAC_AMP, and agree it should be removed. I will make this modification once I am done with my review of the code and testing.

[rkehoe]

I removed NPIX_AMP array from the output metrics and updated tests/plots. This is ready to merge pending travis test.

[rkehoe]

Merging.