Llr optimizer initial

Hi Sebastian,

This is my latest pull request, which includes the initial code for the LLR Optimizer analysis. I have also updated Steve's template.py code, by taking the approach you suggested-grab his template.py from his repo and incorporate all the suggestions that I commented on myself. I also have tried to upload all data and input files, so if there are any missing, please let me know! The only thing really missing from the optimizer analysis code right now is the implementation of a few additional systematics, as well as adding the priors on the parameters that we do not wish to constrain.
I would prefer not to have physical default values here. The reason is that we are quite often calling this function with the `**params` syntax. Now if for some reason one of the keys in `**params` is not quite correct (e.g. `lifetime` instead of `livetime`), it will be ignored and the given default is used. If the default is `None`, it will become obvious, e.g. in `report_params`, otherwise, it will seem as if the parameter is simply not accepted.