Added support for MS Visual Studio CRT memory leak tracing:
* Made a new CMake parameter : WITH_MSCRT_DEBUG=YES/NO (default NO)
* Added a code to my_init.c to initialize the CRT debugging to print to stderr
* Enabled convertion all malloc to _malloc_dbg, calloc to _calloc_dbg  and realloc to _realloc_dbg to get line numbers in the report
* Renamed all the class methods and members named free/malloc/calloc/realloc to mem_free/mem_malloc/mem_calloc/mem_realloc to avoid
  conflicts with the #define
* Marked the my_malloc/my_free allocations as "client" blocks and left all the others as "normal" blocks.
* Made sure NDB compiles too
* Addressed Magnus' comments (renamed some of the ndb mem_free to more meaningful names)
* Addressed second set of Magnus' comments (renamed num_free_bytes) to num_free.
* updated to the latest trunk
* fixed an ndb compilation failure on windows
* Addressed Jon-Olav's remarks: moved definiton out of my_global.h, some cmake cleanups.