load KWS and DASMaps from DASMaps repo/urls

* the file URLs are grouped into interdependent consituents
* each is defined in a separate config file named objname.conf, e.g. das.conf, inputvals.conf
* each of these contain:
  - a clean script (named clean_objname.js)
  - a list of related update files (named update_db_collection.js)
* the clean+updates will happen either on all of items defined in a objname.conf or none