multiple data nodes

[abigailkeller]

We likely need to figure out how to handle situations when dataNames is not a scalar (i.e., multiple data nodes). For example, the code in R/runCalibrationNIMBLE.R breaks at line 132 if length(dataNames) > 1.

[salleuska]

Fair. Fix in 9624612

• use nodes instead of names via expandNodeNames()
• replaced [[ ]] with values() whne extracting data

Leaving open in case something else is missing