Be more verbose if the accesslist can not be found

ot_accesslist.c

@@ -59,7 +59,9 @@ static void accesslist_readfile( int sig ) {
   accesslist_filehandle = fopen( g_accesslist_filename, "r" );
 
   if( accesslist_filehandle == NULL ) {
-    fprintf( stderr, "Warning: Can't open accesslist file: %s (but will try to create it later, if necessary and possible).", g_accesslist_filename );
+    char *wd = getcwd( NULL, 0 );
+    fprintf( stderr, "Warning: Can't open accesslist file: %s (but will try to create it later, if necessary and possible).\nPWD: %s\n", g_accesslist_filename, wd );
+    free( wd );
     return;
   }
 
@@ -154,4 +156,4 @@ int accesslist_isblessed( ot_ip6 ip, ot_permissions permissions ) {
   return 0;
 }
 
-const char *g_version_accesslist_c = "$Source$: $Revision$\n";
+const char *g_version_accesslist_c = "$Source$: $Revision$\n";