python: add get_name & set_name for automata

* wrap/python/spot_impl.i (get_name, set_name): New methods for twa.
* wrap/python/tests/remfin.py: Test them.
* wrap/python/ajax/spotcgi.in: Use set_name().
* NEWS: Mention it.

wrap/python/ajax/spotcgi.in

@@ -658,6 +658,7 @@ if output_type == 'm':
     unbufprint('<div class="automata-stats">')
     dont_run_dot = print_stats(automaton)
     unbufprint('</div>')
+    automaton.set_name(str(f))
     render_automaton(automaton, dont_run_dot)
     automaton = 0
     finish()
@@ -752,6 +753,7 @@ if output_type == 'a':
         del s
     else: # 't' or 's'
         dont_run_dot = print_stats(degen, True)
+        automaton.set_name(str(f))
         render_automaton(degen, dont_run_dot)
     degen = 0
     automaton = 0

wrap/python/spot_impl.i

@@ -187,6 +187,13 @@ using namespace spot;
     $result = SWIG_NewPointerObj(new spot::formula($1), $descriptor(spot::formula*), SWIG_POINTER_OWN);
 }
 
+%typemap(out) std::string* {
+  if (!$1)
+    $result = SWIG_Py_Void();
+  else
+    $result = SWIG_FromCharPtr($1->c_str());
+}
+
 %exception {
   try {
     $action
@@ -330,6 +337,18 @@ namespace std {
   std::string __str__() { return spot::str_psl(*self); }
 }
 
+%extend spot::twa {
+  void set_name(std::string name)
+  {
+    self->set_named_prop("automaton-name", new std::string(name));
+  }
+
+  std::string* get_name()
+  {
+    return self->get_named_prop<std::string>("automaton-name");
+  }
+}
+
 %extend spot::acc_cond::acc_code {
   std::string __repr__()
   {

wrap/python/tests/remfin.py

@@ -35,3 +35,7 @@ State: 0
 State: 1
 [t] 1
 --END--""")
+
+assert(aut.get_name() == None)
+aut.set_name("test me")
+assert(aut.get_name() == "test me")