Extend the ELTL parser to support more complex aliases of

automaton operators such as Strong=G(F($0))->G(F($1)) and
G=R(false, $0).

* src/eltlparse/eltlparse.yy, src/eltlparse/eltlscan.ll: Add
support for more complex aliases.
* src/eltltest/acc.cc, src/eltltest/acc.test: Adjust.
* src/ltlast/nfa.cc, src/ltlast/nfa.hh (arity): Now returns an
unsigned value.
* src/tgbatest/eltl2tgba.test: Adjust.
* src/tgbalagos/eltl2tgba_lacim.cc: Fix sanity.

src/eltltest/acc.cc

@@ -22,6 +22,9 @@
 #include <iostream>
 #include <cassert>
 #include "eltlparse/public.hh"
+#include "ltlvisit/destroy.hh"
+#include "ltlvisit/lunabbrev.hh"
+#include "ltlvisit/nenoform.hh"
 
 int
 main(int argc, char** argv)
@@ -37,6 +40,12 @@ main(int argc, char** argv)
     return 1;
   }
 
+  const spot::ltl::formula* f1 = spot::ltl::unabbreviate_logic(f);
+  const spot::ltl::formula* f2 = spot::ltl::negative_normal_form(f1);
+  spot::ltl::destroy(f1);
+
   assert(f != 0);
   std::cout << f->dump() << std::endl;
+  assert(f2 != 0);
+  std::cout << f2->dump() << std::endl;
 }

src/eltltest/acc.test

@@ -22,6 +22,18 @@ A(1,a,a|b)&X(!f)
 EOF
 run 0 ./acc input || exit 1
 
+cat >input <<EOF
+include prelude
+A=(
+    0 1 \$2
+    1 2 \$0
+    accept 0
+  )
+%
+A(1,a)
+EOF
+run 1 ./acc input || exit 1
+
 cat >input <<EOF
 X=(
     0 1 true