fix #1718 use pkcollections.Dict for flattened template params
fix #1718 use pkcollections.Dict for flattened template params

mrakitin/sirepo,mkeilman/sirepo,mkeilman/sirepo,mkeilman/sirepo,mrakitin/sirepo,radiasoft/sirepo,radiasoft/sirepo,radiasoft/sirepo,mkeilman/sirepo,radiasoft/sirepo,mrakitin/sirepo,mrakitin/sirepo,radiasoft/sirepo