Debug Malloc (Dmalloc) Library Release Notes

Bug fix release to repair a number of problems and issues regarding the free-blank and alloc-blank tokens. See the bugs section for more information.

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Just to make clear, when a pointer is allocated (or reallocated) with the 'alloc-blank' or 'check-blank' tokens enabled, the library clears various parts of the allocation block with the allocation-blank character (ALLOC_BLANK_CHAR in settings.h). If the 'free-blank or 'check-blank' tokens are enabled, when a pointer is freed, the library clears all of the space with the free-blank character (FREE_BLANK_CHAR in settings.h).

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The library was was clearing the user spaces of an allocated chunk with the alloc-blank character and the non-user spaces with the free-blank character. This seemed confusing and wrong so now all sections of an allocated chunk are cleared with the alloc-blank character.
Fixed a couple of longer standing stupid bugs. Basically the library was doing some pointer arithmetic assuming that the fence-post settings were enabled. I'm surprised this worked on any architectures. Thanks to Philippe for the feedback.