Patched large memory leak in Context cleanup for OpenCL platform.

platforms/opencl/include/OpenCLPlatform.h

@@ -67,6 +67,7 @@ public:
 class OpenCLPlatform::PlatformData {
 public:
     PlatformData(int numParticles, int deviceIndex);
+    ~PlatformData();
     OpenCLContext* context;
     bool removeCM;
     int cmMotionFrequency;

platforms/opencl/src/OpenCLPlatform.cpp

@@ -105,3 +105,7 @@ OpenCLPlatform::PlatformData::PlatformData(int numParticles, int deviceIndex) :
     device << context->getDeviceIndex();
     propertyValues[OpenCLPlatform::OpenCLDeviceIndex()] = device.str();
 }
+
+OpenCLPlatform::PlatformData::~PlatformData() {
+    delete context;
+}