changes to config.r do not suppress warning message:

Calculating FinalizeScores function...
There were 12 warnings (use warnings() to see them)
> warnings()
Warning messages:
1: In min(d[[fld_value]], na.rm = T) :
  no non-missing arguments to min; returning Inf
2: In max(d[[fld_value]], na.rm = T) :
  no non-missing arguments to max; returning -Inf
3: In min(d[[fld_value]], na.rm = T) :
  no non-missing arguments to min; returning Inf
4: In max(d[[fld_value]], na.rm = T) :
  no non-missing arguments to max; returning -Inf
5: In min(d[[fld_value]], na.rm = T) :
  no non-missing arguments to min; returning Inf
6: In max(d[[fld_value]], na.rm = T) :
  no non-missing arguments to max; returning -Inf
7: In min(d[[fld_value]], na.rm = T) :
  no non-missing arguments to min; returning Inf
8: In max(d[[fld_value]], na.rm = T) :
  no non-missing arguments to max; returning -Inf
9: In CheckLayers("layers.csv", "layers", flds_id = conf$config$layers_id_fields) :
  Missing fields...
    le_wage_cur_adj_value: NA value
    le_wage_cur_base_value: NA value
    le_wage_ref_adj_value: NA value
    le_wage_ref_base_value: NA value
    le_wage_sector_year: NA value
10: In CheckLayers("layers.csv", "layers", flds_id = conf$config$layers_id_fields) :
  Unused fields...
    le_wage_cur_adj_value: sector.1
    le_wage_cur_base_value: sector.1
    le_wage_ref_adj_value: sector.1
    le_wage_ref_base_value: sector.1
    le_wage_sector_year: sector.1
11: In min(d$p, na.rm = T) : no non-missing arguments to min; returning Inf
12: In max(d$p, na.rm = T) : no non-missing arguments to max; returning -Inf
updated README.md to reflect updates and instructions