species v0.1.4

• The spectrum argument of add_object is changed to a dictionary which can contain multiple spectra and optionally their covariance matrix.
• Compatibility of FitModel and FitPlanck with multiple spectra and optionally the use of covariance matrices in the MCMC sampling.
• Possibility to use a combination of multiple temperatures and radii in FitPlanck.
• delete_data function for removing a dataset from the database.
• Additional functionalities in plot_color.
• All spectral resampling is done with spectres. This is slower than before but more accurate.
• wavel_resample parameter in get_model to resample to an input wavelength grid.
• Data is stored in the database as float64 instead of float32.
• Changed the BT-Settl spectra from CIFIST2011 to CIFIST2011c.
• Additional errors and warnings.
• Major maintenance, small improvements, and several bug fixes.