Raise an error if data and angle shapes don't match in NIRReflectance

[pnuu]

This is a fix to a minor bug that I encountered when using nir_reflectance modifier with VIIRS SDR data. By default Satpy loads the highest resolution (I channel) datasets, and when this modifier is used in a composite using M-channel data there's a crash because the arrays have different shapes.

Naturally, the correct way to define the composite is to use the nir_reflectance_lowres modifier where the proper resolution is defined.

• Tests passed
• Passes flake8 satpy

[djhoese]

This should probably use projectables = self.match_data_arrays(projectables) instead to match the other compositors/modifiers and handle cases other than the area/shape differences.

[djhoese]

Oh there are a couple compositors that don't use this. Thoughts on adding this to all of them?

[coveralls]

Coverage decreased (-0.03%) to 89.315% when pulling 20ed611 on pnuu:bugfix-nirreflectance-areas into bbfb44f on pytroll:master.

[codecov]

Codecov Report

Merging #1107 into master will decrease coverage by 0.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #1107      +/-   ##
==========================================
- Coverage   89.34%   89.32%   -0.02%     
==========================================
  Files         195      195              
  Lines       28785    28790       +5     
==========================================
+ Hits        25717    25718       +1     
- Misses       3068     3072       +4     

Impacted Files	Coverage Δ
satpy/composites/__init__.py	78.67% <50.00%> (-0.31%)	⬇️
satpy/tests/test_composites.py	100.00% <100.00%> (ø)
satpy/scene.py	90.00% <0.00%> (-0.18%)	⬇️

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[pnuu]

Oh, that was a new method to me! I've changed NIRReflectance and the emissive modifiers. I wasn't sure what to do when optional prereqs are used, like in PSPAtmosphericalCorrection.

[mraspaud]

LGTM, thanks for fixing this, I stumble upon it myself recently.