Implement suite of new bootstrap current scalings

[chris-ashe]

While doing work on #3263, I came across several papers giving lists of bootstrap current scalings not yet implemented in PROCESS though could easily be.

From the paper by Tobias Hartman there is this list (https://inis.iaea.org/search/search.aspx?orig_q=RN:45031642):

• Hoang et al model: https://www.osti.gov/biblio/16442

• Andrade and Ludwig model: https://iopscience.iop.org/article/10.1088/0741-3335/50/6/065001/pdf

• ASC model: https://qedfusion.org/LIB/REPORT/CONF/ACTsyscodedocs/ASC_FED2_Dragojlovic.pdf (Seems to be from Zoran Dragojlovic working on the ARIES programme)

• TOPPER model: No reference yet

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There is also scalings from this paper by Ki. G et.al. (https://doi.org/10.1016/j.fusengdes.2014.07.009)

• ARIES-SC model: https://www.sciencedirect.com/science/article/pii/S0920379610000414
  (Seems to be the same as the ASC model above)

• Andrade model: https://iopscience.iop.org/article/10.1088/0741-3335/50/6/065001/pdf
  -(Same as Andrade and Ludwig from above)

Gi et.al also presents two scalings of their own type

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There is also scalings from the recently implemented Sakai et.al paper (https://www.sciencedirect.com/science/article/pii/S092037961930818X?via%3Dihub)

[mkovari]

Sounds like a great idea, but I would argue that one up-to-date and credible scaling with some thought put into the implementation is better than a dozen scalings that no-one will use.

Note that the Sakai scaling has already been implemented - #3268.