Support for current profiles that set I(s) directly instead of I'(s). #470
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Simsopt current assumes that for any current profile, curtor in the input file is given by the integral of the profile.
However, there are advanced profiles (see https://princetonuniversity.github.io/STELLOPT/VMEC%20Advanced%20Profiles) that set I(s) directly, i.e. the total current inside the flux-surface s. For such profiles, no integration is necessary. They are also often smoother than the current density, which might make it easier to represent them with fewer degrees of freedom and thus render them suitable for optimization.
This simple pull request implements support for such profiles by adding a code-path where curtor is set by the value of the profile at I(s).