Fix Continuum calls in spectrum and radLoss, tests, and improve documentation about chiantipy HOT 5 CLOSED

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@kdere the previous version of the continuum module had free-free loss (freeFreeLoss) and free-bound loss (freeBoundLoss) methods. These are used in the radLoss module to calculate the free-free and free-bound contributions to the radiative loss function.

Do you have a reference for what formulas are used to calculate these loss rates? Are these just the free-free and free-bound emission summed over wavelength? I've looked at both the IDL code and the old continuum methods and haven't been able to sort this out.

from chiantipy.

yes, they are just integrated/summed over wavelength, as I remember

from chiantipy.

also, there are new look-up tables for the free-bound loss rate, the ADS ref is:

http://adsabs.harvard.edu/abs/2017A%26A...599A..10M

we don't have this in Chianti yet but it should be there.

from chiantipy.

Ok thanks. I've sorted out the free-free loss rate equation (it is actually in Rybicki & Lightman, Eq. 5.15a). The free-bound loss rate is a bit trickier, but I think I've figured it out from the Mewe et al. (1985) and Gronenschild and Mewe (1978) papers along with the CHIANTI IDL code.

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