ttH ntuple Bug Fixes

This MR alleviates several bugs previously occurring due to specifics of the ttH ntuples. Most of these are to do with the usage of a binary classifier, which was buggy in the framework previously. Some more have to do with the usage of forbidden expressions in variable names (specifically, the usage of /) as ntuple variables are given in dimensions of MeV instead of GeV.

Some bugs caused by the usage of vectorized ntuple variables have been fixed as well.

Additionally, lxbatch functionality has been added as well. A dedicated readme.md for this can be found in lxbatch. However, a big amount of manual work is currently still required for this. This will be fixed in a future revision.