TODO

mv psydac/feec/tests/todo_test_derivatives.py to psydac/feec/tests/test_derivatives.py once it is fixed
Add GMRES solver to 'psydac.linalg.solvers'
Add unit tests for Cart subcommunicators in 'psydac.ddm.cart'
Create parallel 'KroneckerLinearOperator' in 'psydac.linalg.kronecker' using Cart subcommunicators
Create object of type 'psydac.fem.psydacines.SplineSpace' with Cart
Extend functionality of 'SplineSpace' class: . add (private?) methods 'init_fem' and 'init_collocation' . call methods above when required . add method 'compute_interpolant( self, values, field )' . implement 'eval_field_gradient' method
Create 'SplineMapping' class in module 'psydac.mapping.discrete'
add a section in documentation about hdf5 installation (serial/parallel) + h5-tools (install+usage)

Core

reorganize code in api (no change to codgen)
additional tests and unit tests in api/tests
for the moment the codegen is not using the support from space:
- allow fem_context to be called with grid and degrees, and return a discrete space and a None for mapping.
- use support in codegen/interface
normal vector in 3d
periodic bc in codegen
init_fem is called everytime wa call discretize: maybe we should first do some checks (nderiv is ok norder etc)
hessian not yet implemented in sympde and api
add other solvers to the solver_driver (only cg is available now)
however, we need to clear the cache of sympy after 1d, 2d and 3d tests, otherwise pytest will crash.
add sympde and pyccel install procedure; maybe wget to download the requierements files as requirements_pyccel.txt etc then call pip3
api tests should be moved to examples
shall we add the Boundayr object as an attribut of SplineMapping? what to do if we don't use a mapping? we can also add the notion of a patch ...
DiscreteModel is not up to date; changes need to be done because of the SumForm concept that was introduced lately. in fact, things will become even easier. a Model will be like a namespace or a Module.
add BoundaryDomain to define the whole boundary of a domain