Improvement in electrostic field solve when using EB & a small refactoring of the Electrostatic solver (#2143)

* refactored parts of the electrostatic solver to allow an outside Poisson solver to be installed

* added callback to install a Poisson solver that can be used instead of the MLMG solver

* added call to the poissonsolver callback if one is installed and updated ElectrostaticSolver.cpp to calculate the electric field directly in amrex if EBs are used

* fixed issue causing ElectrostaticSphereEB test to crash

* fixed the logic for when to call computeE

* added function to allow charge density to be deposited in rho_fp from outside WarpX

* fixed inconsistency between labframe and relativistic electrostatic simulation setup

* fixed typo

* fixed issue that caused ElectrostaticSphere test to fail and removed unnecessary call to multiply E_y by -1 when doing a 2d simulation

* revert edit to error handling string

* changes requested during PR review

* additional change requested during PR review

* fixed typo

* revert unnecessary changes

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/Python/WarpX_py.cpp b/Source/Python/WarpX_py.cpp
index f53bc007c..79beed3c6 100644
--- a/Source/Python/WarpX_py.cpp
+++ b/Source/Python/WarpX_py.cpp
@@ -12,6 +12,7 @@ extern "C" {
 
     WARPX_CALLBACK_PY_FUNC_0 warpx_py_afterinit = nullptr;
     WARPX_CALLBACK_PY_FUNC_0 warpx_py_beforeEsolve = nullptr;
+    WARPX_CALLBACK_PY_FUNC_0 warpx_py_poissonsolver = nullptr;
     WARPX_CALLBACK_PY_FUNC_0 warpx_py_afterEsolve = nullptr;
     WARPX_CALLBACK_PY_FUNC_0 warpx_py_beforedeposition = nullptr;
     WARPX_CALLBACK_PY_FUNC_0 warpx_py_afterdeposition = nullptr;