xcalloc / xmalloc

[John Darrington]

alloc.c contains a function called xcalloc, which is like xmalloc except that
it initialises it's memory to zero.  

I suggest that we 

1.  Rename xcalloc to something like zmalloc.

2.  Implement an xcalloc function which wraps calloc, in the same way that
    xmalloc wraps malloc. 

3.  Prefer the new xcalloc where appropriate.  Ie: rather than:

        xmalloc(n_things * sizeof *things);

    use

        xcalloc(n_things, sizeof *things);

    The former raises the possibility of integer overflow and hence buffer 
    overrun.  In the latter case, we have more opportunity for bounds checking.


        





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