Merge the core and python tests in the tests/ directory

* 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.

tests/python/remfin.py

@@ -0,0 +1,49 @@
+import spot
+
+# This test used to trigger an assertion (or a segfault)
+# in scc_filter_states().
+aut = spot.automaton("""
+HOA: v1
+States: 3
+Start: 1
+AP: 1 "a"
+Acceptance: 1 Inf(0)
+--BODY--
+State: 0 {0}
+[t] 0
+State: 1
+[!0] 0
+[0] 2
+State: 2
+[t] 2
+--END--
+""")
+aut.prop_inherently_weak(True)
+aut = spot.dtwa_complement(aut)
+aut1 = spot.scc_filter_states(aut)
+assert(aut1.to_str('hoa') == """HOA: v1
+States: 2
+Start: 0
+AP: 1 "a"
+acc-name: co-Buchi
+Acceptance: 1 Fin(0)
+properties: trans-labels explicit-labels state-acc deterministic
+properties: inherently-weak
+--BODY--
+State: 0
+[0] 1
+State: 1
+[t] 1
+--END--""")
+
+assert(aut.scc_filter_states().to_str() == aut1.to_str())
+assert(aut1.get_name() == None)
+aut1.set_name("test me")
+assert(aut1.get_name() == "test me")
+# The method is the same as the function
+
+a = spot.translate('true', 'low', 'any')
+assert(a.prop_deterministic() == False)
+assert(a.prop_unambiguous() == False)
+assert(a.is_deterministic() == True)
+assert(a.is_unambiguous() == True)