scc: get rid of scc_stats

* src/tgbaalgos/scc.cc, src/tgbaalgos/scc.hh: Here.
* src/tgbatest/ltl2tgba.cc: Remove option -k.
* src/tgbatest/sccsimpl.test: Move the only -k test...
* src/tgbatest/scc.test:... here.

src/tgbatest/ltl2tgba.cc

@@ -273,8 +273,6 @@ syntax(char* prog)
 	    << "Output options (if no emptiness check):" << std::endl
 	    << "  -b    output the automaton in the format of spot"
             << std::endl
-	    << "  -k    display statistics on the automaton (size and SCCs)"
-	    << std::endl
 	    << "  -ks   display statistics on the automaton (size only)"
 	    << std::endl
 	    << "  -kt   display statistics on the automaton (size + "
@@ -553,10 +551,6 @@ checked_main(int argc, char** argv)
 	  output = 17;
 	  hoa_opt = argv[formula_index] + 2;
 	}
-      else if (!strcmp(argv[formula_index], "-k"))
-	{
-	  output = 9;
-	}
       else if (!strcmp(argv[formula_index], "-ks"))
 	{
 	  output = 12;
@@ -1608,10 +1602,6 @@ checked_main(int argc, char** argv)
 		  }
 		break;
 	      }
-	    case 9:
-	      stats_reachable(a).dump(std::cout);
-	      build_scc_stats(a).dump(std::cout);
-	      break;
 	    case 10:
 	      {
 		auto aa =

src/tgbatest/scc.test

@@ -27,6 +27,7 @@ cat >formulas<<EOF
 b U a,3,2,2
 0,0,1,1
 (Gb | F!a) W GFc,22,6,5
+(!a & G(Ga | F(!a & b))) | (a & F(F!a & G(a | !b))),16,7,6
 EOF
 
 run 0 ../../bin/ltl2tgba --low --any --stats='%f,%e,%s,%c' -F formulas/1 >out

src/tgbatest/sccsimpl.test

@@ -171,18 +171,3 @@ test `grep '^acc' out8.txt | wc -w` = 4
 run 0 ../ltl2tgba -R3 -s -RDS -ks \
   '(G(!((b) R (a)))) R (((c) R (!(d))) U (G((a) | (!(G(e))))))' > out9.txt
 grep 'states: 6$' out9.txt
-
-
-# From Spot 1.1 to 1.1.2, this failed with a BDD error because of
-# a bug in scc_filter().
-run 0 ../ltl2tgba -R3 -k '(a) <-> F(Ga <-> F!(b -> a))' >stdout
-cat >expected <<EOF
-transitions: 21
-states: 8
-total SCCs: 6
-accepting SCCs: 3
-dead SCCs: 0
-accepting paths: 4
-dead paths: 0
-EOF
-diff stdout expected