Have to_sfl use NFP in the grids used to fit new Equilibrium

[dpanici]

No description provided.

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     +0.67 +/- 3.89     | +3.43e-03 +/- 1.99e-02 |  5.15e-01 +/- 1.9e-02  |  5.11e-01 +/- 4.8e-03  |
 test_equilibrium_init_medres            |     +0.60 +/- 0.28     | +2.42e-02 +/- 1.14e-02 |  4.06e+00 +/- 6.2e-03  |  4.03e+00 +/- 9.5e-03  |
 test_equilibrium_init_highres           |     +0.69 +/- 0.55     | +3.72e-02 +/- 2.96e-02 |  5.41e+00 +/- 2.1e-02  |  5.37e+00 +/- 2.1e-02  |
 test_objective_compile_dshape_current   |     +0.17 +/- 0.70     | +6.34e-03 +/- 2.65e-02 |  3.81e+00 +/- 2.1e-02  |  3.80e+00 +/- 1.6e-02  |
 test_objective_compute_dshape_current   |     +0.27 +/- 1.54     | +9.41e-06 +/- 5.29e-05 |  3.45e-03 +/- 4.6e-05  |  3.44e-03 +/- 2.6e-05  |
 test_objective_jac_dshape_current       |     -0.58 +/- 7.37     | -2.34e-04 +/- 2.97e-03 |  4.00e-02 +/- 1.6e-03  |  4.02e-02 +/- 2.5e-03  |
 test_perturb_2                          |     +0.69 +/- 1.45     | +1.17e-01 +/- 2.46e-01 |  1.71e+01 +/- 1.6e-01  |  1.70e+01 +/- 1.8e-01  |
 test_proximal_freeb_jac                 |     -1.44 +/- 1.03     | -1.07e-01 +/- 7.66e-02 |  7.33e+00 +/- 6.5e-02  |  7.44e+00 +/- 4.0e-02  |
 test_solve_fixed_iter                   |     -0.89 +/- 60.21    | -4.48e-02 +/- 3.02e+00 |  4.97e+00 +/- 2.1e+00  |  5.01e+00 +/- 2.1e+00  |

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.44%. Comparing base (6ab8327) to head (34d3808).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1246   +/-   ##
=======================================
  Coverage   95.44%   95.44%           
=======================================
  Files          95       95           
  Lines       23402    23402           
=======================================
  Hits        22337    22337           
  Misses       1065     1065           

Files with missing lines	Coverage Δ
desc/equilibrium/coords.py	88.75% <100.00%> (ø)

... and 2 files with indirect coverage changes