species v0.5.5

• Added the add_accretion method to Database for adding the accretion coefficients (see Aoyama et al. 2021), including the extrapolation from Marleau & Aoyama (2022).
• Feature in EmissionLine for converting hydrogen line luminosities in accretion luminosities (see updated tutorial)
• Support for the clear and cloudy model spectra from Saumon & Marley (2008), to be added with the tags 'saumon2008-clear' and 'saumon2008-cloudy'
• Support for the grid of model spectra from Petrus et al. (2023), to be added with the tag 'petrus2023'
• Safe extraction of TAR files (thanks to @TrellixVulnTeam)
• Added envelope parameter to plot_pt_profile and plot_spectrum
• Added create_color_magnitude and create_color_color methods to ReadModel
• Support in plot_color_magnitude and plot_color_color for output from ReadModel
• Refactored working with companion data and added the companion_data.json file to the repository (see updated tutorial)
• Started implementing pooch for downloading files
• Added spectra of GQ Lup B to companion_spectra
• Added inc_model_name parameter to plot_spectrum
• Added get_condensation_curve function to retrieval_util
• Updated documentation, docstrings, and tutorials
• Minor maintenance and improvements to code style