Fix for non-unique track decorations by JetFitter (ATLASRECTS-6528)
With this fix, every instance of JetFitter adds its own decoration. A non-ambiguous naming scheme is adopted, based on jet collection. Corresponding changes to exclusion / inclusion lists are included. This fix also makes sure all tracks are decorated.
As a consequence, this also fixes irreproducible output between MP/MT.
Mentioning @dguest, @duperrin, @sanmay and @vdao, all involved in the process.