fixed Monaco NA that NA'd out entire OHI score

--> needed mean(x, na.rm=T) not just mean(x)
added precautionary max(na.rm=T); layers not changed
added precautionary max(na.rm=T); layers not changed
added precautionary max(na.rm=T); layers not changed
added max(na.rm=T)
oked merge error

Merge branch 'master' of https://github.com/OHI-Science/ohiprep

Conflicts:
	Global/WorldBank-WGI_v2013/data/rgn_wb_wgi_2013a_inverse.csv