Updated  models/ed/R/write.configs.ed.R to output Rd0, in addition to Dark Resp Factor.  This change reflects the updates to the ED2 model to use Rd0 (base resp) rather than DRF (older model versions).
Merge pull request #32 from serbinsh/pecan.Rd0

Updated models/ed/R/write.configs.ed.R to output Rd0