Moved some old files into the old directory

Some had been in "trash" before, others just didn't seem
relevant anymore but I didn't want to delete them yet because
they contain material I may want to refer to as I continue
developing.
Moved old annealing code to /old
Scripts to submit jobs on orchestra
Removed *.pck from .gitignore
Pickled file of initial start values for parallel model
A script to calculate GR conv crit from list of chain file
Made nbd_mcmc_lsf.sh executable
Randomized initial values for all params of parallel model

Added code to nbd_model_shared to return randomized initial values
for the shared values; and code in nbd_parallel_model that creates
random initial values for the models specific to the parallel model
and then concatenates them to the random values that are shared.
NBD MCMC code can read input data from file

Wrote it to take a command-line argument indicating a pickle file
and an index file; the index file is used to retrieve a vector
of randomized initial values from the pickled file.