Improve handling of Assigning profiles to Equilibrium

[dpanici]

Improve handling of Assigning profiles to avoid equilibria having both iota and current assigned.

Resolves #1482

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     +2.33 +/- 7.74     | +1.21e-02 +/- 4.01e-02 |  5.30e-01 +/- 3.1e-02  |  5.18e-01 +/- 2.6e-02  |
 test_equilibrium_init_medres            |     -0.23 +/- 3.65     | -9.59e-03 +/- 1.49e-01 |  4.08e+00 +/- 1.3e-01  |  4.09e+00 +/- 7.1e-02  |
 test_equilibrium_init_highres           |     +7.67 +/- 4.66     | +4.16e-01 +/- 2.53e-01 |  5.84e+00 +/- 1.2e-01  |  5.42e+00 +/- 2.2e-01  |
 test_objective_compile_dshape_current   |     +5.25 +/- 4.81     | +2.04e-01 +/- 1.87e-01 |  4.09e+00 +/- 1.8e-01  |  3.89e+00 +/- 3.1e-02  |
 test_objective_compute_dshape_current   |     +0.43 +/- 1.57     | +2.22e-05 +/- 8.07e-05 |  5.15e-03 +/- 5.9e-05  |  5.13e-03 +/- 5.5e-05  |
 test_objective_jac_dshape_current       |     +2.90 +/- 4.29     | +1.23e-03 +/- 1.82e-03 |  4.36e-02 +/- 1.1e-03  |  4.24e-02 +/- 1.4e-03  |
 test_perturb_2                          |     +6.87 +/- 3.74     | +1.34e+00 +/- 7.28e-01 |  2.08e+01 +/- 6.5e-01  |  1.95e+01 +/- 3.4e-01  |
 test_proximal_freeb_jac                 |     -0.95 +/- 1.17     | -7.09e-02 +/- 8.74e-02 |  7.38e+00 +/- 6.3e-02  |  7.45e+00 +/- 6.0e-02  |
 test_solve_fixed_iter                   |     -1.59 +/- 4.08     | -5.30e-01 +/- 1.36e+00 |  3.28e+01 +/- 9.5e-01  |  3.33e+01 +/- 9.7e-01  |
 test_LinearConstraintProjection_build   |     -5.88 +/- 2.97     | -6.37e-01 +/- 3.22e-01 |  1.02e+01 +/- 2.4e-01  |  1.08e+01 +/- 2.2e-01  |
 test_build_transform_fft_midres         |     +1.12 +/- 3.18     | +6.74e-03 +/- 1.92e-02 |  6.10e-01 +/- 1.7e-02  |  6.03e-01 +/- 8.1e-03  |
 test_build_transform_fft_highres        |     +1.76 +/- 1.50     | +1.69e-02 +/- 1.45e-02 |  9.80e-01 +/- 1.1e-02  |  9.63e-01 +/- 9.4e-03  |
 test_equilibrium_init_lowres            |     +1.81 +/- 1.72     | +6.85e-02 +/- 6.51e-02 |  3.85e+00 +/- 4.7e-02  |  3.78e+00 +/- 4.5e-02  |
 test_objective_compile_atf              |     -1.04 +/- 1.57     | -8.49e-02 +/- 1.28e-01 |  8.08e+00 +/- 9.2e-02  |  8.17e+00 +/- 8.8e-02  |
 test_objective_compute_atf              |     -1.91 +/- 3.81     | -3.08e-04 +/- 6.15e-04 |  1.58e-02 +/- 4.5e-04  |  1.61e-02 +/- 4.2e-04  |
 test_objective_jac_atf                  |     -0.43 +/- 3.16     | -8.73e-03 +/- 6.34e-02 |  2.00e+00 +/- 5.7e-02  |  2.01e+00 +/- 2.8e-02  |
 test_perturb_1                          |     +0.05 +/- 1.11     | +7.86e-03 +/- 1.63e-01 |  1.47e+01 +/- 7.8e-02  |  1.46e+01 +/- 1.4e-01  |
 test_proximal_jac_atf                   |     +0.90 +/- 0.75     | +7.42e-02 +/- 6.16e-02 |  8.29e+00 +/- 5.4e-02  |  8.22e+00 +/- 3.0e-02  |
 test_proximal_freeb_compute             |     +0.12 +/- 1.12     | +2.42e-04 +/- 2.23e-03 |  2.00e-01 +/- 1.9e-03  |  2.00e-01 +/- 1.2e-03  |
 test_solve_fixed_iter_compiled          |     -0.41 +/- 1.14     | -8.37e-02 +/- 2.33e-01 |  2.04e+01 +/- 1.4e-01  |  2.05e+01 +/- 1.8e-01  |

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.69%. Comparing base (41b57dd) to head (e2e4e06).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1521   +/-   ##
=======================================
  Coverage   95.69%   95.69%           
=======================================
  Files         101      101           
  Lines       25601    25605    +4     
=======================================
+ Hits        24499    24503    +4     
  Misses       1102     1102           

Files with missing lines	Coverage Δ
desc/equilibrium/equilibrium.py	96.09% <100.00%> (+0.02%)	⬆️

... and 2 files with indirect coverage changes