This version adds data preprocessing functions.
1. Note: DSConfig.xml and DeyoCCI.csv are related.
the tag: target->columns->col has to be mapped with Name col in
DeyoCCI.csv.
2. Data preparation steps.
   1. Read config file: DeyoCCI.csv (common function) and
   DSConfig.xml(individually for each dataset worker.)
   2. Map worker feature to common feature ID.
3. Next version is going to add DB functions.
   Todo: connect DB to IMEDS, select patient profile, write patient
   features to csv.