Created the CptDataset class, moved mean/SD calcs to it

Moved a bunch of code around in simulation.py in anticipation of turning it
into CptDataset methods, but it's currently commented out.

Made appropriate changes in plot_timecourse.plot_timecourse_comparison to use
the new class, and also in __init__ to the the data as a CptDataset object.
Refactored histogram calcs and plotting to use CptDataset
Removed get_obserables_values b/c it's not necessary

We can now get the values for the observables directly by slicing
the data matrix.
Implemented means_across_cpts as a method of CptDataset

And updated the print_cpt_means_and_vars func in plot_funcs appropriately.
Moved boilerplate submission main to simulation.run_main
Deprecated/killed the single condition BNG submit/parse

From now on data goes into data directories, is parsed from data directories,
and the HDF5 files parse back are 4D, with the first axis the number of
conditions.
Updated tbid_bax_activation/plot_timecourse to take cond_index

So now the condition can be specified by the caller
Removed unnecessary imports from plots.py
Updated translocation data analysis to use HDF5
Updated translocation notes to use new data/plotting code
Updated tbid_bax_activation docs to use new data/plotting