Add a new cost function to constrain the total current #89
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Now, it is able to penalize the total current in coils with
Ic=1
. The formula isisum = ((SUM(I_i) - target_isum) / target_isum)**2
. Users can useweight_isum
to turn it on and the target current (unit in Ampere) for all coils WITHIc=1
is specified bytarget_isum
.Using this new function, users can constrain the total poloidal current while letting the current in each coil differ.