scc_filter_states: also remove useless acceptance marks

* src/twaalgos/sccfilter.hh,
src/twaalgos/sccfilter.cc (scc_filter_states): Remove useless acceptance
marks while preserving state-based acceptance.  Add a new argument
to specify if all useless mark have to be removed, like for scc_filter.
* src/twaalgos/simulation.cc: Use the new parameter.
* src/twaalgos/postproc.cc: Likewise.  Also call do_scc_filter even
after WDBA simplification to cleanup trivial SCCs.  Preserve state-based
acceptance for weak automata.
* src/tests/readsave.test: Add one test.
* src/tests/dstar.test, src/tests/prodor.test, src/tests/remfin.test,
src/tests/sim3.test, wrap/python/tests/automata.ipynb,
wrap/python/tests/piperead.ipynb: Adjust expected output.
* NEWS: Mention the change.

src/tests/dstar.test

@@ -244,7 +244,7 @@ digraph G {
   node [shape="circle"]
   I [label="", style=invis, width=0]
   I -> 0
-  0 [label="0", peripheries=2]
+  0 [label="0"]
   0 -> 1 [label="!a & !b"]
   0 -> 2 [label="a & !b"]
   1 [label="1", peripheries=2]

src/tests/prodor.test

@@ -96,15 +96,15 @@ Acceptance: 2 Inf(0) | Inf(1)
 properties: trans-labels explicit-labels state-acc complete
 properties: deterministic
 --BODY--
-State: 0 {0 1}
+State: 0 {1}
 [0] 1
 [!0] 2
-State: 1 {0 1}
+State: 1 {1}
 [0&1] 3
 [!0&1] 4
 [0&!1] 5
 [!0&!1] 6
-State: 2 {0}
+State: 2
 [0&1] 3
 [!0&1] 4
 [0&!1] 5

src/tests/readsave.test

@@ -700,3 +700,40 @@ diff output3 expect3
 
 $autfilt -Hk input 2>stderr && exit 1
 grep 'print_hoa.*k' stderr
+
+cat >input4 <<EOF
+HOA: v1
+States: 3
+Start: 0
+AP: 2 "a" "b"
+Acceptance: 2 Inf(0) & Inf(1)
+--BODY--
+State: 0 {0}   [0] 1
+State: 1 {1}   [1] 2
+State: 2 {0 1} [0] 2
+--END--
+EOF
+
+$autfilt -H --small --high input4 >output4
+cat output4
+
+cat >expect4<<EOF
+HOA: v1
+States: 3
+Start: 1
+AP: 2 "a" "b"
+acc-name: Buchi
+Acceptance: 1 Inf(0)
+properties: trans-labels explicit-labels state-acc deterministic
+properties: inherently-weak
+--BODY--
+State: 0
+[1] 2
+State: 1
+[0] 0
+State: 2 {0}
+[0] 2
+--END--
+EOF
+
+diff output4 expect4

src/tests/remfin.test

@@ -663,7 +663,7 @@ State: 6
 [0] 0
 [!0] 6
 State: 7
-[0] 4 {0}
+[0] 4
 [!0] 6
 State: 8
 [0] 8 {0}
@@ -679,22 +679,22 @@ properties: trans-labels explicit-labels trans-acc
 State: 0
 [0&1] 0 {0}
 [!0&1] 1 {0}
-[0&!1] 11 {0}
+[0&!1] 11
 [!0&!1] 12
 State: 1
 [0&1] 0 {0}
 [!0&1] 1 {0}
-[0&!1] 11 {0}
+[0&!1] 11
 [!0&!1] 12
 State: 2
 [!0&1] 2 {0}
 [0&1] 9
-[!0&!1] 10 {0}
-[0&!1] 11 {0}
+[!0&!1] 10
+[0&!1] 11
 State: 3
-[!0&1] 1 {0}
+[!0&1] 1
 [0&1] 3 {0}
-[0&!1] 11 {0}
+[0&!1] 11
 [!0&!1] 12
 State: 4
 [!0&1] 4 {0}
@@ -706,7 +706,7 @@ State: 5
 [!0&!1] 10 {0}
 [0&!1] 12
 State: 6
-[!0&1] 4 {0}
+[!0&1] 4
 [0&1] 6 {0}
 [0&!1] 11 {0}
 [!0&!1] 12
@@ -750,23 +750,23 @@ Start: 0
 AP: 2 "p1" "p0"
 acc-name: Buchi
 Acceptance: 1 Inf(0)
-properties: trans-labels explicit-labels state-acc complete
+properties: trans-labels explicit-labels trans-acc complete
 properties: deterministic
 --BODY--
 State: 0
 [!1] 0
 [0&1] 2
 [!0&1] 3
-State: 1 {0}
-[!1] 1
-[1] 2
-State: 2 {0}
-[!1] 1
-[1] 2
-State: 3 {0}
-[!1] 0
+State: 1
+[!1] 1 {0}
+[1] 2 {0}
+State: 2
+[!1] 1 {0}
+[1] 2 {0}
+State: 3
+[!1] 0 {0}
 [0&1] 2
-[!0&1] 3
+[!0&1] 3 {0}
 --END--
 HOA: v1
 States: 5
@@ -782,7 +782,7 @@ State: 1
 [t] 1 {0}
 State: 2
 [!0&1] 0
-[0] 1 {0}
+[0] 1
 [!0&!1] 2 {0}
 State: 3
 [1] 0

src/tests/sim3.test

@@ -60,7 +60,7 @@ Acceptance: 4 (Fin(0) & Inf(1)) | (Fin(2) & Inf(3))
 properties: trans-labels explicit-labels state-acc complete
 properties: deterministic
 --BODY--
-State: 0 {0}
+State: 0
 [!1] 1
 [1] 3
 State: 1 {1 3}