Improve malloc debug #61
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_malloc.corth contains the base procedures and the macros in malloc.corth expands to those procedures so no run-time performance is lost while using the regular dynamic memory management procedures. This change is made to allow adding debugging tools to these procedures.
debug_malloc now defines its own version of malloc, mfree, mfree-deep and mlength. These new macro can be used to add tags to dynamicly-placed objects to test for memory leaks. debug_malloc.corth and malloc.corth can no longer be included together.
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Renamed the old file malloc.corth to _malloc.corth and renamed all the malloc functions with lower level procedure names. The new malloc.corth file now contains aliases to the lower level procedures. The debug_malloc.corth library now adds a tag to all the "malloced" objects which can be accessed to debug the memory leaks.