* tests/: Rename as...
* tests/core/: ... this.
* python/tests/: Rename as...
* tests/python/: ... this.
* python/tests/run.in: Move as...
* tests/run.in: This, and adjust.
* tests/Makefile.am: Adjust to run both core and python tests.
* configure.ac, README, debian/python3-spot.examples, debian/rules,
doc/org/tut.org, python/Makefile.am, spot/ltsmin/Makefile.am,
spot/ltsmin/kripke.test, spot/sanity/ipynb.test: Adjust.

* wrap/python/: Rename to...
* python/: ... this.
* wrap/: Delete.
* Makefile.am, README, configure.ac, debian/python3-spot.examples,
debian/rules, doc/org/.dir-locals.el.in, doc/org/init.el.in,
spot/sanity/ipynb.test: Adjust.

* wrap/python/tests/decompose.ipynb: Adjust text.
* spot/twaalgos/strength.hh, spot/twaalgos/strength.cc:
Adjust to extract inherently weak SCCs instead of weak SCCs.  This gets
rids of the special handling for the "corner cases".
* spot/tests/strength.test: Adjust.
* NEWS: Mention it.

* wrap/python/spot.py: Here.
* wrap/python/tests/decompose.ipynb: Use it to simplify the code.

* NEWS: Mention the fixed bug.
* src/twaalgos/dot.cc: Fix.
* wrap/python/tests/decompose.ipynb: Use it.

* wrap/python/tests/decompose.ipynb: New file.
* wrap/python/tests/Makefile.am: Add it.
* src/twaalgos/strength.cc: Fix corner cases.
* src/tests/strength.test: Adjust corner case.
* NEWS, doc/org/tut.org: Mention the notebook.