Update VIIRS EDR Active Fires

[rdaruwala]

Updates the VIIRS EDR Active Fires reader to read AFEDR, AFIMG, and AFMOD NetCDF and CSV files.

For AFEDR and AFMOD, the following parameters can be accessed:

• confidence_pct
• power
• T13
• latitude & longitude

For AFIMG, the following parameters can be accessed:

• confidence_cat

• power

• T4

• latitude & longitude

• Closes Update 'viirs_edr_active_fires' reader to read newest algorithm output #725

• Tests added

• Tests passed

• Passes git diff origin/master -- "*py" | flake8 --diff

[coveralls]

Coverage increased (+0.1%) to 80.77% when pulling 9c72cbd on rdaruwala:reader-fires into 5fee138 on pytroll:master.

[djhoese]

A couple questions and a couple changes.

Also, could you add some information in the top docstring of the reader python module about the different file types (AFEDR is the pre-release (dev) version of the product); like MOD versus IMG differences (confidence, etc)?

[codecov]

Codecov Report

Merging #733 into master will increase coverage by 0.11%.
The diff coverage is 98.62%.

@@            Coverage Diff             @@
##           master     #733      +/-   ##
==========================================
+ Coverage   80.67%   80.78%   +0.11%     
==========================================
  Files         149      149              
  Lines       21661    21773     +112     
==========================================
+ Hits        17474    17590     +116     
+ Misses       4187     4183       -4

Impacted Files	Coverage Δ
satpy/readers/viirs_edr_active_fires.py	93.61% <100%> (+3.61%)	⬆️
.../tests/reader_tests/test_viirs_edr_active_fires.py	97.16% <98.47%> (+0.98%)	⬆️
satpy/writers/geotiff.py	41.66% <0%> (-0.36%)	⬇️
satpy/readers/yaml_reader.py	93.36% <0%> (+1.05%)	⬆️

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[djhoese]

I'd like some cleanup on the platform handling. Otherwise looking good.

[djhoese]

I was going to ask why the CLASS active fires files weren't included but then remembered that the files I gave you didn't have any fires in them. I went to CLASS to try to find some and can't even find the product to be able to download new files...so I guess we'll support them when they are more widely used/available.