nonzero_harvest_years_min = 4 (from 2)
cleaned up Congo files and code
lagged NP year_max per scenario to match old web results
Merge pull request #12 from OHI-Science/master

updating ss_wgi layer from Julie
Merge pull request #73 from bbest/master

Global/FAO-Commodities fixes for NP
Merge pull request #10 from OHI-Science/master

updating Julie's repo