summarise national data for transborder MRs
add multicore parallelism
added function to calculate raw broad sector GVA data; moved sector groups to list
return vector
use uppercase for consistency
fix column name
various code simplification and updates to newer data structures
calculate all broad sectors data
removed legacy data import test (JS)
use z-scores for average growth rates
added functions to calculate sector percentages
calculate sector percentages and merge them with main dataset