Update ionization and recombination rates to Chianti 9.0

[namurphy]

Version 9.0 of the Chianti database has some notable changes:

With Version 9.0, CHIANTI explicitly includes the processes of dielectronic recombination and autoionization. While this does not change the predicted spectrum at low densities, it allow for the exploration of the density sensitivity of some of the satellite lines at high densities. The atomic models for which these changes have been implemented include lithium sequence ions with significant astrophysical abundances and the iron ions Fe XVIII through Fe XXIII.

In addition, existing datasets are updated, new ions added. New total recombination rates for several Fe ions are included and the ionization equilibrium has been recomputed.

I believe the code for recreating these data files is somewhere in the NEI-modeling/NEI repository, but I can't remember where. The read-in routines may need to be updated because:

A new file type, .auto, contains the autoionization rates fora given ion, such as fe_18.auto for Fe XVIII. Consequently, the new database and IDL programs are incompatible with the previous CHIANTI versions and vice-versa. Also, versions 0.8.0 and later of ChiantiPy are required for the new database.

[wtbarnes]

Relevant to wtbarnes/fiasco#61