fix various memory leaks

src/mesh.cpp

@@ -246,6 +246,8 @@ static scene::IAnimatedMesh* extrudeARGB(u32 twidth, u32 theight, u8 *data)
 		}
 	}
 
+	delete[] solidity;
+
 	// Add to mesh
 	scene::SMesh *mesh = new scene::SMesh();
 	mesh->addMeshBuffer(buf);

src/server.cpp

@@ -904,6 +904,9 @@ Server::~Server()
 	*/
 	stop();
 
+	//shutdown all emerge threads first!
+	delete m_emerge;
+
 	/*
 		Delete clients
 	*/
@@ -923,7 +926,6 @@ Server::~Server()
 	// Delete things in the reverse order of creation
 	delete m_env;
 	delete m_rollback;
-	delete m_emerge;
 	delete m_event;
 	delete m_itemdef;
 	delete m_nodedef;

src/test.cpp

@@ -1781,5 +1781,7 @@ void run_tests()
 		errorstream<<"run_tests() aborting."<<std::endl;
 		abort();
 	}
+	delete idef;
+	delete ndef;
 }