Resolve "`Result.plot_corner` should still work OOTB if I move the hdf5 file"

Closes #260

See merge request lscsoft/bilby!319

Resolves #266 and improve saved log likelihoods and priors

Closes #266

See merge request !324

ROQ implementation into bilby

See merge request !247

* Adds the roq_data from the public repo to /roq_basis
* Removes the version specifications from the scipy install. These are
  not actually being used at all, just creating junk files.

Resolve "GW-specific result object"

Closes #251

See merge request !331

detailed tutorial for open data

See merge request !315

Docs: Corrected typo in the basics of PE page, maths section.

See merge request !338

Add GraceDB reading example

See merge request !334

adding ptmcmc tutorial

See merge request !336

Elevate the warning message to an error and do the same for emcee

See merge request !325