GUI: Add menuitem to edit open project file.

Earlier we opened project file only for editing. But now that we
really use project files we need separate feature for editing
them.

gui/main.ui

@@ -74,9 +74,12 @@
      <string>&amp;File</string>
     </property>
     <addaction name="mActionOpenXML"/>
+    <addaction name="separator"/>
     <addaction name="mActionNewProjectFile"/>
     <addaction name="mActionOpenProjectFile"/>
+    <addaction name="mActionEditProjectFile"/>
     <addaction name="mActionCloseProjectFile"/>
+    <addaction name="separator"/>
     <addaction name="mActionSave"/>
     <addaction name="mActionQuit"/>
    </widget>
@@ -383,6 +386,14 @@
     <string>C&amp;lose Project File</string>
    </property>
   </action>
+  <action name="mActionEditProjectFile">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
+   <property name="text">
+    <string>&amp;Edit Project File...</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>

gui/mainwindow.cpp

@@ -90,6 +90,7 @@ MainWindow::MainWindow() :
     connect(mUI.mActionNewProjectFile, SIGNAL(triggered()), this, SLOT(NewProjectFile()));
     connect(mUI.mActionOpenProjectFile, SIGNAL(triggered()), this, SLOT(OpenProjectFile()));
     connect(mUI.mActionCloseProjectFile, SIGNAL(triggered()), this, SLOT(CloseProjectFile()));
+    connect(mUI.mActionEditProjectFile, SIGNAL(triggered()), this, SLOT(EditProjectFile()));
 
 #ifdef WIN32
     connect(mUI.mActionHelpContents, SIGNAL(triggered()), this, SLOT(OpenHelpContents()));
@@ -692,6 +693,7 @@ void MainWindow::OpenProjectFile()
     if (!filepath.isEmpty())
     {
         mUI.mActionCloseProjectFile->setEnabled(true);
+        mUI.mActionEditProjectFile->setEnabled(true);
         mProject = new Project(filepath, this);
         mProject->Open();
         QStringList paths = mProject->GetProjectFile()->GetCheckPaths();
@@ -714,6 +716,7 @@ void MainWindow::NewProjectFile()
         Project prj(filepath, this);
         prj.Create();
         prj.Edit();
+        mUI.mActionEditProjectFile->setEnabled(true);
     }
 }
 
@@ -722,6 +725,22 @@ void MainWindow::CloseProjectFile()
     delete mProject;
     mProject = NULL;
     mUI.mActionCloseProjectFile->setEnabled(false);
+    mUI.mActionEditProjectFile->setEnabled(false);
+}
+
+void MainWindow::EditProjectFile()
+{
+    if (!mProject)
+    {
+        QMessageBox msg(QMessageBox::Critical,
+                        tr("Cppcheck"),
+                        QString(tr("No project file loaded")),
+                        QMessageBox::Ok,
+                        this);
+        msg.exec();
+        return;
+    }
+    mProject->Edit();
 }
 
 void MainWindow::ShowLogView()

gui/mainwindow.h

@@ -152,6 +152,12 @@ public slots:
     */
     void CloseProjectFile();
 
+    /**
+    * @brief Slot to edit project file.
+    *
+    */
+    void EditProjectFile();
+
     /**
     * @brief Slot for showing the log view.
     *