detailed tutorial for open data

The tutorial is based on GW150914.py, with the addition of more in depth comments. The code has been adapted to be used for other LOSC events, i.e. all arguments are explicitly specified (e.g. interferometer_names, sample_rate, npoints..), so that they can be easily edited by the user.

examples/open_data_examples/advanced_opendata.py

@@ -88,8 +88,8 @@ likelihood = bilby.gw.likelihood.GravitationalWaveTransient(
 # LIST OF AVAILABLE SAMPLERS: Run -> bilby.sampler.implemented_samplers
 npoints = 500  # number of live points for the MCMC (dynesty)
 sampler = 'dynesty'
-# Different samplers can have different additional kwargs, 
-# visit https://lscsoft.docs.ligo.org/bilby/samplers.html for details. 
+# Different samplers can have different additional kwargs,
+# visit https://lscsoft.docs.ligo.org/bilby/samplers.html for details.
 
 result = bilby.run_sampler(
     likelihood, prior, outdir=outdir, label=label,