Add PBD::init and PBD::cleanup

A bit of refactoring to move initialization of libpbd into libpbd
rather than rely on "client" code(ui,libardour,tests etc) to do it

libs/pbd/pbd.cc

@@ -0,0 +1,59 @@
+/*
+    Copyright (C) 2011 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <iostream>
+#include <cstdlib>
+
+#include <glibmm/thread.h>
+
+#include "pbd/pbd.h"
+#include "pbd/debug.h"
+#include "pbd/id.h"
+#include "pbd/enumwriter.h"
+
+#include "i18n.h"
+
+namespace {
+
+static bool libpbd_initialized = false;
+
+}
+
+bool
+PBD::init ()
+{
+	if (libpbd_initialized) {
+		return true;
+	}
+
+	if (!Glib::thread_supported()) {
+		Glib::thread_init();
+	}
+
+	PBD::ID::init ();
+
+	libpbd_initialized = true;
+	return true;
+}
+
+void
+PBD::cleanup ()
+{
+	EnumWriter::destroy ();
+}

libs/pbd/pbd/pbd.h

@@ -0,0 +1,30 @@
+/*
+    Copyright (C) 2011 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __libpbd_pbd_h__
+#define __libpbd_pbd_h__
+
+namespace PBD {
+
+	bool init ();
+	void cleanup ();
+
+} // namespace PBD
+
+#endif

libs/pbd/wscript

@@ -56,6 +56,7 @@ libpbd_sources = [
     'openuri.cc',
     'pathexpand.cc',
     'pathscanner.cc',
+    'pbd.cc',
     'pool.cc',
     'property_list.cc',
     'pthread_utils.cc',