Giving a suggested command to run if the user passes aligned-spin posterior samples to make_BBH_spin_evolution_and_fit_application_pipeline.py. Also checking to make sure there are no tidal samples in both make_BBH_spin_evolution_and_fit_application_pipeline.py and apply_fits_and_append_samples.py.

automated_postproc_utils.py: Catching possible errors from 'which <script name>' to address the issue David Keitel found, and improving some messages.

Updating the logic in automated_postproc_utils.py to deal with cases where the code is installed using setup.py build instead of setup.py install, as well as related changes to the other code.

 -mark most arguments as required,
  so that scripts don't throw weird error messages further down
 -always call argparse before print_Git_status
  for cleaner output in case of error or for --help
 -fix import in split_posterior_samples.py
 -simplify ntasks int/str handling in make_BBH_...
 -update README with full install commandline
 -update .gitignore with build products

fix ntasks int/str handling

Modifications so that the check of whether we are running the installed version checks the specific script being run.

Adding a check that make_BBH_spin_evolution_and_fit_application_pipeline.py is run using the lalinference_o2 branch of LALSuite.

Add setup.py for installation, and make appropriate changes to Git_status.py so that it returns the Git hash of the install if there's an installed version (logic still needs some tweaking to make it so that this is only returned if one is *running* the installed version).

make_BBH_spin_evolution_and_fit_application_pipeline.py: Put SEOBNRv3 approximant number in variable

evolve_spins.py: Adding appropriate instances of np.atleast_1d to avoid problems when a sample file has only one sample.

Adding code to make_BBH_spin_evolution_and_fit_application_pipeline.py so that it uses flow instead of f_ref for SEOBNRv3 samples, and also checks to make sure that the start orbital velocities of the samples are all below the ISCO orbital velocity.

Fixing the printing of o2-postprocessing Git info in Git_status.py (for log files) and also including output of the numpy and scipy versions.

Removing the incorrectly added codes and adding the correct ones with the additional checks on the posterior_samples.dat file input.

Adding an explicit computation of the averaged fit result for afz to apply_fits_and_append_samples.py, so that it will run with the existing version of lalinference_o2, fixing the o2-postprocessing Git status check in Git_status.py and allowing the code in combine_and_append_evolved_posterior_samples_non-HDF5.py that removes the intermediate small files from the parallelization to run.

Restoring some incorrectly deleted code in make_BBH_spin_evolution_and_fit_application_pipeline.py and updating compare_samples.py to work with the output of the updated automated postprocessing scripts.

Now overwrite old samples with new samples, named with *_evol in all cases, and overwrite posterior_samples.dat file.

Improving error and warning messages and implementing changes in response to some of David's comments.