Use FSNOSEED to denote unseeded or full scan chain seeds
This MR renames FS or '' used to denote full scan seeded chains. It is discussed in: https://its.cern.ch/jira/browse/ATR-20612
This MR renames FS or '' used to denote full scan seeded chains. It is discussed in: https://its.cern.ch/jira/browse/ATR-20612