More progress on the CMake plugin

Made the cmake plugin even more usable by implementing:
Pop up a wizard if there is a .user file but no .cbp file. (Fixes empty
project reported on irc.)
Pop up a wizard if the .cbp file is older then the CMakeLists.txt file,
thus reparsing the file. (Note: There is a bug that we need to actually
also check the last modified of all included files.)
Reparse the cbp file to add new RunConfigurations / delete no longer
existing RunConfigurations and update those that have changed.-
Show a nicer title in the Projects/RunConfiguration pane

src/plugins/qt4projectmanager/qt4project.cpp

@@ -256,6 +256,7 @@ Qt4Project::~Qt4Project()
     m_manager->unregisterProject(this);
     delete m_projectFiles;
     delete m_toolChain;
+    m_toolChain = 0;
 }
 
 void Qt4Project::defaultQtVersionChanged()