simulation: fix determinism check

Commit bda40a5f introduced a subtle bug where nm_minato was being
increased in more cases causing some non-deterministic automata to be
incorrectly tagged as deterministic automata.

Fixes issue #575, reported by Dávid Smolka.

* spot/twaalgos/simulation.cc (create_edges): Do not increment
nm_minato when dest is bddfalse.
* tests/core/568.test: Add Dávid's first test-case.
* tests/python/forq_contains.py: Add Dávid's second test-case.

tests/core/568.test

@@ -101,3 +101,27 @@ EOF
 # Using autcross will also test tgba_determinize
 genaut --cycle-onehot-nba=11..12 --cycle-log-nba=11..12 |
   autcross --language-preserved 'autfilt --small' --verbose
+
+
+
+# A test case from issue #575
+cat >575.hoa <<EOF
+HOA: v1 States: 16 Start: 0 AP: 7 "p12" "p28" "p14" "p34" "p30" "p29"
+"p35" acc-name: Buchi Acceptance: 1 Inf(0) properties: trans-labels
+explicit-labels state-acc --BODY-- State: 0 [0&1&!3] 1 [0&1&3] 2
+[!0&1&!3] 3 [0&!1&!3] 4 [!0&!1&3] 5 [!0&1&3] 6 [0&!1&3] 7 [!0&!1&!3] 8
+State: 1 {0} [t] 1 State: 2 [!3] 1 [3] 2 State: 3 [t] 9 State: 4 [t]
+10 State: 5 [3] 12 [!3 | !6] 13 State: 6 [!3 | !6] 9 [3] 14 State: 7
+[!3 | !6] 10 [3] 15 State: 8 [t] 13 State: 9 [2] 1 [!2] 9 State: 10
+[4] 1 [!4] 10 [!4&5] 11 State: 11 {0} [5] 11 State: 12 [2&!3&4] 1
+[2&3&4] 2 [!2&!3&4] 9 [2&!3&!4] 10 [2&!3&!4&5] 11 [!2&3&!4] 12
+[!2&!3&!4] 13 [!2&3&4] 14 [2&3&!4] 15 State: 13 [2&4] 1 [!2&4] 9
+[2&!4] 10 [2&!4&5] 11 [!2&!4] 13 State: 14 [2&!3] 1 [2&3] 2 [!2&!3] 9
+[!2&3] 14 State: 15 [!3&4] 1 [3&4] 2 [!3&!4] 10 [!3&!4&5] 11 [3&!4] 15
+--END--
+EOF
+# the automaton original bug was detected by print_hoa, which complained
+# that the non-derministic automaton was incorrectly tagged as deterministic.
+# So let's print the automaton in HOA format before checking its size.
+autfilt --small 575.hoa -H > res.hoa
+test "16 49 0" = "`autfilt --stats='%s %e %d' res.hoa`"