species v0.3.6

• Functionalities for the analysis of emission lines (see EmissionLine and the notebook tutorial).
• Update in data.filters to comply with the change on the SVO website regarding the detector type.
• The wavel_resample parameter was added to Database.get_mcmc_spectra and ReadPlanck.get_spectrum.
• The phot_type parameter was added to Database.get_mcmc_photometry.
• The smooth_spectrum and resample_spectrum methods were added to ModelBox.
• The read_util.gaussian_spectrum function was added.
• Stellar and companion properties were added to data.companions.
• Functionalities for comparing a spectrum with a grid of model spectra (see CompareSpectra.compare_model, Database.get_compare_sample, and plot_grid_statistic).
• Some refactoring in ReadModel for improved readability.
• A number of smaller improvements to the code and documentation.