CSDA calculation: provide more significant figures and total energy

[jbrage]

Would it be possible to

1. select the energy either as MeV or MeV/u?
2. provide at least 3-4 significant figures for the range?

[grzanka]

@jbrage I've improved a bit the calculator, check it again at:
https://libamtrack.github.io/web_dev/#Calculators/CSDArange

once you are happy, I will propagate the changed to https://libamtrack.github.io/web/ as well

By the way - do you have some good suggestion on the default values of all the text fields and on the description ?

[grzanka]

Do you think similar changes should be applied here ?
https://libamtrack.github.io/web_dev/#Particlerangeandstoppingpower/CSDArangevsenergy

[jbrage]

excellent, thanks!
I am not sure it is necessary to implement it in that function too; the user now has the possibility in the other function already? or maybe it would be handy?