Structures to define an event interpretation have been moved into namespaces of the corresponding classes

Otherwise it would not be possible to use both thq and ttbar recostructions simultaneously. For the same reason explicit specification of namespace is used for BNNs.
Plugins for MVA reconstruction now give access to full event interpretations
Added a plugin to calculated input observables for thq analyses

There is a problem at linking stage.
Definitions of all functions from headers with BNNs have been moved to source files

I.e. now BNNs follow the normal paradigm of separation of declaration and definition. Should do something to bnn-hep...
Bugfix: THInputVarsPlugin was not saving anything to the tree