Scott Snyder authored 5 years ago and Adam Edward Barton committed 5 years ago

Remove mutable cache in LArFebConfig --- it can't really be making
any significant difference.  But add a method to retrieve both upper
and lower thresholds in one go.  Thus can also remove the locking.
Convert the map to an unordered_map.  Add a method to fill the map,
allowing the removal of the friend declaration.