ltlcross: replace %H,%T,%N by %O

Also get rid of the lbt_parser, and fix the LBT support of the HOA
parser.

* doc/org/ltlcross.org, doc/org/ltldo.org: Update.
* src/bin/common_trans.cc, src/bin/common_trans.hh: Add support for
%O, and keep %T,%N,%H as hidden aliases without disabling them.
* src/bin/ltlcross.cc, src/bin/ltldo.cc, src/tgbatest/ltl2tgba.cc:
Call hoa_parse instead of lbt_parse.
* src/hoaparse/hoaparse.yy: Improve error reporting from LBT.
* src/hoaparse/hoascan.ll: Fix typos preventing parsing of
LBT files with more than 10 states.
* src/tgbaalgos/lbtt.cc, src/tgbaalgos/lbtt.hh: Delete the lbt
parser.
* src/tgbatest/lbttparse.test: Adjust the expected error message.
* NEWS: Update.

src/tgbatest/lbttparse.test

@@ -1,7 +1,7 @@
 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2012, 2013, 2014 Laboratoire de Recherche et Développement
-# de l'Epita (LRDE).
+# Copyright (C) 2012, 2013, 2014, 2015 Laboratoire de Recherche et
+# Développement de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
 #
@@ -122,7 +122,7 @@ cat > input <<EOF
 -1
 EOF
 cat >expected <<EOF
-input:3.5-20: failed to parse guard
+input:3.5-20: failed to parse guard:  & ! "a" ! "b" !
 input:3.20: syntax error, unexpected '!', expecting end of formula
 input:3.20: ignoring trailing garbage
 EOF