Making FTagAnalysisSequence more user-friendly
This MR adds in a postfix parameter to the FTagAnalysisSequence to be more in line with the other analysis algorithm sequences. Without this it isn't possible to run the same b-tagging algorithm on two different collections (e.g. VR track jets and R=0.4 jets).
Also adds an optional 'preselection' parameter which allows you to specify a subset of jets to apply the tagging to without having to use view containers.