Fix some cppcheck reports:

- [opencl/openclwrapper.cpp:853]: (error) Memory leak: mpArryDevsID
- [textord/fpchop.cpp:813]: (warning) 'operator=' should check for assignment to self to avoid problems with dynamic memory (+ others)
- [opencl/openclwrapper.cpp:1356]: (style) Unused variable: memStream

I noticed too these:
[classify/normmatch.cpp:104]: (error) Array 'feature.Params[1]' accessed at index 1, which is out of bounds.
[classify/normmatch.cpp:106]: (error) Array 'feature.Params[1]' accessed at index 2, which is out of bounds.
[classify/normmatch.cpp:108]: (error) Array 'feature.Params[1]' accessed at index 3, which is out of bounds.
[classify/normmatch.cpp:130]: (error) Array 'feature.Params[1]' accessed at index 2, which is out of bounds.
[classify/normmatch.cpp:138]: (error) Array 'feature.Params[1]' accessed at index 3, which is out of bounds.
[opencl/openclwrapper.cpp:2906]: (error) Array 'imageData4[4]' accessed at index 8519679, which is out of bounds.
[opencl/openclwrapper.cpp:2907]: (error) Array 'imageData4[4]' accessed at index 8519679, which is out of bounds.
[opencl/openclwrapper.cpp:2908]: (error) Array 'imageData4[4]' accessed at index 8519679, which is out of bounds.
[opencl/openclwrapper.cpp:2909]: (error) Array 'imageData4[4]' accessed at index 8519679, which is out of bounds.
but don't know how to fix them.