`write.config.xml.ED2()` doesn't use correct ED2 default dataset.

[Eric R. Scott]

Bug Description

Because the datasets history, history.r46, etc. are non-exported, data() doesn't work on them. Current code to find the correct dataset based on the <revision> tag is therefore broken

pecan/models/ed/R/write.configs.ed.R

Line 451 in ab55731

 data(list=histfile, package = 'PEcAn.ED2', envir = environment()) 

Proposed solution

Internal data should be referenced with packagename:::dataset, so I'll replace the non-functioning code with a switch() statement like:

edhistory <- switch(revision, "85" = PEcAn.ED2:::history.r85, ...)