Feature/treecoverloss add carbon pools

[dagibbs22]

Pull request checklist

Please check if your PR fulfills the following requirements:

• [x] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
• [x] Make sure you are making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• [x] Check the commit's or even all commits' message styles matches our requested structure.
• [x] Check your code additions will fail neither code linting checks nor unit test.

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

Carbon stock totals in 2000 cannot be analyzed in the treecoverloss package of Geotrellis.

What is the new behavior?

• Aboveground carbon, belowground carbon, and soil carbon in 2000 are now optionally summed (megagrams C) and reported in the treecoverloss package.
• Corresponding changes have been made to the ArcPy client to allow carbon stocks to be analyzed through that interface.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

Changed readme accordingly.

[jterry64]

@dagibbs22 looks good, just had some minor formatting comments

[codecov[bot]]

Codecov Report

Merging #102 (a761d56) into develop (13d1218) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           develop    #102      +/-   ##
==========================================
- Coverage     1.08%   1.08%   -0.01%     
==========================================
  Files          239     239              
  Lines         4869    4905      +36     
==========================================
  Hits            53      53              
- Misses        4816    4852      +36     

Flag	Coverage Δ
unittests	1.08% <0.00%> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...marystats/treecoverloss/TreeCoverLossCommand.scala	0.00% <0.00%> (ø)
...twatch/summarystats/treecoverloss/TreeLossDF.scala	0.00% <0.00%> (ø)
...atch/summarystats/treecoverloss/TreeLossData.scala	0.00% <0.00%> (ø)
...ch/summarystats/treecoverloss/TreeLossExport.scala	0.00% <0.00%> (ø)
...mmarystats/treecoverloss/TreeLossGridSources.scala	0.00% <0.00%> (ø)
...h/summarystats/treecoverloss/TreeLossSummary.scala	0.00% <0.00%> (ø)
...atch/summarystats/treecoverloss/TreeLossTile.scala	0.00% <ø> (ø)

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