a lot of changes to documentation

Author: pancetta

CHANGELOG.rst

@@ -1,5 +1,12 @@
 Changelog
 ---------
+
+- August 11, 2021: Version 4.1 has some more changes under the hood, most of them with no significant impact to users.
+  The CI pipeline has been completely rewritten, porting the code to `Github Actions <https://github.com/features/actions>`_
+  (away from `Travis CI <https://travis-ci.com/>`_), to `flake8 <https://flake8.pycqa.org>`_ and to `pytest <https://pytest.org>`_
+  (away from `nose <https://nose.readthedocs.io>`_). One thing that may have an impact on users is that following the changes
+  made in Version 4.0, the PETSc data structures are now much easier, removing a lot of unnecessary boilerplate code.
+
 - May 4, 2021: Long time, no see, but this major release 4.0 marks some improvements under the hood:
 
   - **Rewrote ``mesh`` and ``particle`` data type**: Creation of new arrays for each operation is now avoided by

README.rst

@@ -42,7 +42,7 @@ To check your installation, run
 
 .. code-block:: bash
 
-   nosetests -v pySDC/tests
+   pytest pySDC/tests
 
 You may need to update your ``PYTHONPATH`` by running
 
@@ -60,7 +60,7 @@ You can achieve this e.g. by
 
    conda install -c conda-forge mpich petsc4py mpi4py fenics
 
-Most of the code is tested automatically using `Travis-CI <https://travis-ci.org/Parallel-in-Time/pySDC>`_, so a working version of the installation process can always be found in the `install`-block of the `.travis.yml <https://github.com/Parallel-in-Time/pySDC/blob/master/.travis.yml>`_ file.
+Most of the code is tested automatically using `Github Actions <https://github.com/Parallel-in-Time/pySDC/actions>`_, so a working version of the installation process can always be found in the `ci_pipeline.yml <https://github.com/Parallel-in-Time/pySDC/blob/master/.github/workflows/ci_pipeline.yml>`_ file.
 
 For many examples, `LaTeX` is used for the plots, i.e. a decent installation of this is needed in order to run the tests.
 When using `fenics` or `petsc4py`, a C++ compiler is required (although installation may go through at first).
@@ -71,7 +71,7 @@ For more details on `pySDC`, check out `http://www.parallel-in-time.org/pySDC <h
 How to cite
 -----------
 
-If you use pySDC or parts of it for your work, great! Let us know if we can help you with this. Also, we would greatly appreciate a citation using `this paper <https://doi.org/10.1145/3310410>`_:
+If you use pySDC or parts of it for your work, great! Let us know if we can help you with this. Also, we would greatly appreciate a citation of `this paper <https://doi.org/10.1145/3310410>`_:
 
    Robert Speck, **Algorithm 997: pySDC - Prototyping Spectral Deferred Corrections**, 
    ACM Transactions on Mathematical Software (TOMS), Volume 45 Issue 3, August 2019,

pySDC/README_API.rst

@@ -1,11 +1,2 @@
-The Python files contained in ``core``, ``implementations`` and ``helpers`` are fully documented and their API is generated automatically with sphinx-apidoc after each update.
-The API (as well as the tutorial pages) can also be generated manually and locally by executing
-
-.. code-block:: none
-
-   > ./docs/update_apidocs.sh
-   > nosetests -v --with-coverage --cover-erase --cover-inclusive --cover-package=pySDC/core,pySDC/implementations,pySDC/helpers,pySDC/tutorial --cover-html --cover-html-dir=target/doc/build/test_coverage pySDC/tests
-   > travis-sphinx build
-
-in the root directory. Then, the main index can be found in ``target/doc/build/index.html``. Anyway, here is the online version:
+The Python files contained in ``core``, ``implementations`` and ``helpers`` are fully documented and their API is generated automatically with sphinx-apidoc after each update:
 

requirements.txt

@@ -3,7 +3,7 @@ numpy>=1.15.4
 scipy>=0.17.1
 dill>=0.2.6
 # These packages are used in examples or for testing, they can be omitted if necessary
-matplotlib>=1.5.3
+matplotlib>=3.0
 numba>=0.35
 sympy>=1.0
 # These packages are required for some of the more involved examples (and data types etc.), can be omitted

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='pySDC',
-    version='4.0',
+    version='4.1',
     description='A Python implementation of spectral deferred correction methods and the likes',
     license="BSD-2",
     long_description=long_description,
@@ -19,11 +19,9 @@
     include_package_data=True,
 
     install_requires=[
-        'nose>=1.3.7',
         'numpy>=1.15.4',
         'scipy>=0.17.1',
-        'matplotlib>=1.5.3',
-        'pep8',
+        'matplotlib>=3.0',
         'sympy>=1.0',
         'numba>=0.35',
         'dill>=0.2.6',