VCS[git]: Add support for stashes.

Add non-modal stash management dialog and additional menu option
"Stash snapshot..." to stash away changes prompting for a description,
which will immediately replay the stash (take snapshot and continue
working).
Add interface to IVersionControl for creating/restoring/deleting
snapshots for backup/complex undo operations (currently supported
by git only). Add test options to VCSBasePlugin.
Clean up and extend git client accordingly.

src/plugins/git/gitutils.h

@@ -0,0 +1,60 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#ifndef GITUTILS_H
+#define GITUTILS_H
+
+#include <QtCore/QString>
+
+QT_BEGIN_NAMESPACE
+class QDebug;
+class QWidget;
+QT_END_NAMESPACE
+
+namespace Git {
+namespace Internal {
+
+struct Stash {
+    void clear();
+    bool parseStashLine(const QString &l);
+
+    QString name;
+    QString branch;
+    QString message;
+};
+
+QDebug operator<<(QDebug d, const Stash &);
+
+// Make QInputDialog  play nicely
+bool inputText(QWidget *parent, const QString &title, const QString &prompt, QString *s);
+
+} // namespace Internal
+} // namespace Git
+
+#endif // GITUTILS_H