ot.lp reorganise to avoid def in __init__

Author: eloitanguy

Diff for: CONTRIBUTORS.md

@@ -48,7 +48,7 @@ The contributors to this library are:
 * [Camille Le Coz](https://www.linkedin.com/in/camille-le-coz-8593b91a1/) (EMD2 debug)
 * [Eduardo Fernandes Montesuma](https://eddardd.github.io/my-personal-blog/) (Free support sinkhorn barycenter)
 * [Theo Gnassounou](https://github.com/tgnassou) (OT between Gaussian distributions)
-* [Clément Bonet](https://clbonet.github.io) (Wassertstein on circle, Spherical Sliced-Wasserstein)
+* [Clément Bonet](https://clbonet.github.io) (Wasserstein on circle, Spherical Sliced-Wasserstein)
 * [Ronak Mehta](https://ronakrm.github.io) (Efficient Discrete Multi Marginal Optimal Transport Regularization)
 * [Xizheng Yu](https://github.com/x12hengyu) (Efficient Discrete Multi Marginal Optimal Transport Regularization)
 * [Sonia Mazelet](https://github.com/SoniaMaz8) (Template based GNN layers)

Diff for: RELEASES.md

@@ -6,6 +6,8 @@
 - Implement CG solvers for partial FGW (PR #687)
 - Added feature `grad=last_step` for `ot.solvers.solve` (PR #693)
 - Automatic PR labeling and release file update check (PR #704)
+- Implement fixed-point solver for OT barycenters with generic cost functions
+  (generalizes `ot.lp.free_support_barycenter`). (PR #???)
 
 #### Closed issues
 - Fixed `ot.mapping` solvers which depended on deprecated `cvxpy` `ECOS` solver (PR #692, Issue #668)