combined postscript to run all postscripts in a single cmd

There are 3 postscripts (compute_posterior.py, cprofile_summary.py, create_summarypage.py) that are being run through a passthrough_*.sh. There are shared arguments between these files

• Write a utility function(in src) to parse the arguments for all scripts
• Write a script(call generate_summary.py, in bin) to run all 3 scripts using the arguments from the utility function
• run generate_summary.py from the passthrough script.