The elements coloured in the plot are determined via the absorption and emission. It's possible however, that these elements are not the same, e.g. if you specify a limited wavelength range. This could give an error if you try to plot an element not in the emission dataframe, for example. This adds a try statement to catch this case

Added a new column to the packet dataframe that gives the species id. This combines the atomic and ion numbers into a unique id that will be used to group species later.

Added parser to convert request species list into ids to be used by plotter

Call species list parser function

Rearranged parser so it didn't crash if species_list was none

Added in the ion contribution stuff for the mpl plotting.
Also added a new function to get the colorbar labels. This is necessary to determine how many unique colours there should be

Added colouring for ion contributions in plotly figures

Fixed bug in the absorption and emission df calculations. Now they elements should be handled correctly so there won't be errors if a species appears in emission and not absorption, and vice versa

Added comments throughout

Added a new function to work out what colours will be plotted. This was originally repeated multiple times in the code, but now it's a single function that's called multiple times

Also fixed a bug in the absorption luminosities dataframe

Change name of some variables and fixed some typos.