scc_info: determine accepting/rejecting-SCCs for any acceptance

* src/twaalgos/sccinfo.cc, src/twaalgos/sccinfo.hh
(determine_unknown_acceptance): New function to call explicitly
in case one want to know whether the accepting/rejecting status
of all SCCs regardless of the acceptance.
* src/twaalgos/dotty.cc src/twaalgos/sccfilter.cc,
src/twaalgos/sccfilter.hh: Use it.
* src/tests/unambig.test, src/tests/sccdot.test: Add more tests.
* doc/org/oaut.org: Adjust doc for --dot=s, orange is not output
anymore.

src/tests/sccdot.test

@@ -86,12 +86,12 @@ digraph G {
   6 [label="6"]
   }
   subgraph cluster_1 {
-  color=orange
+  color=grey
   label=""
   0 [label="0"]
   }
   subgraph cluster_2 {
-  color=orange
+  color=green
   label=""
   9 [label="9"]
   10 [label="10"]
@@ -148,3 +148,41 @@ digraph G {
 EOF
 
 diff out.dot expected
+
+# While we are here, make sure scc_filter remove those grey SCCs.
+../../bin/autfilt --small -x simul=0 in.hoa -H > out.hoa
+cat >expected.hoa <<EOF
+HOA: v1
+States: 8
+Start: 0
+AP: 2 "a" "b"
+Acceptance: 3 Fin(2) & (Inf(0)&Inf(1))
+properties: trans-labels explicit-labels trans-acc
+--BODY--
+State: 0
+[0&!1] 2
+[1] 3
+State: 1
+[1] 4
+State: 2
+[0&1] 0 {0 1}
+State: 3
+[1] 1
+[!1] 3
+State: 4
+[!0&1] 4 {0 1}
+[0&1] 4 {0 2}
+[t] 5
+State: 5
+[0&1] 5 {0 1}
+[!0&1] 5 {0 2}
+[t] 6
+State: 6
+[!0&1] 6 {0 2}
+[0&1] 7 {0 1}
+State: 7
+[!0&1] 6 {0 1}
+[0&1] 7 {0 2}
+--END--
+EOF
+diff expected.hoa out.hoa