Change the semantics of brk_max to dynamically deal with data segment

bounds. [1]

Modify logic for utilizing the data segment, such that it is possible to
create huge allocations there.

Shrink the data segment when deallocating a chunk, if it is at the end of
the data segment.

Rename chunk_size to csize in huge_malloc(), in order to avoid masking a
static variable of the same name. [1]

Reported by:	Paul Allen <nospam@ugcs.caltech.edu>

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