update IRM export for AMS data

[Swanson-Hysell]

When @duserzym exported MCR 2019 data from the IRM database, it generated a rmag_anisotropy.txt file from the previous MagIC data model. This means that the AMS data is in the previous data model rather than a current 3.0 data model.

Note that one change is that in the previous data model there was a separate value for anisotropy_s1 anisotropy_s2 anisotropy_s3 anisotropy_s4 anisotropy_s5 anisotropy_s6 which are now all in aniso_s (Anisotropy tensor diagonal elements, a six-element colon-delimited list). The example notebook (https://pmagpy.github.io/RockmagPy-notebooks/Anisotropy_plot_AMS.html) is currently using an anisotropy contribution that can be looked to as a model: https://earthref.org/MagIC/19571

Can you have a look at this @peat22?

[Swanson-Hysell]

This export now needs to be tested with IRM exported data being analyzed within the Anisotropy_plot_AMS notebook. @duserzym will export from the IRM database using the update that @peat22 implemented.