Allow relative paths in Build directories, Working Directories

Relative to the project's directory.

src/plugins/qt4projectmanager/qt4projectconfigwidget.cpp

@@ -77,6 +77,7 @@ Qt4ProjectConfigWidget::Qt4ProjectConfigWidget(Qt4Project *project)
 
     m_ui->shadowBuildDirEdit->setPromptDialogTitle(tr("Shadow Build Directory"));
     m_ui->shadowBuildDirEdit->setExpectedKind(Utils::PathChooser::Directory);
+    m_ui->shadowBuildDirEdit->setBaseDirectory(project->projectDirectory());
 
     connect(m_ui->shadowBuildCheckBox, SIGNAL(clicked(bool)),
             this, SLOT(shadowBuildClicked(bool)));