Hello Raúl,

I've fixed the documentation and added an ipow function that handles both
positive and negative ints, having 0^0 == 1 and 0^(negative) == PG_INT64_MAX
since that's what my glibc math.h pow() is returning.

From the comment:

 * For exp < 0 return 0 except when the base is 1 or -1

I think that it should do what POW does in psql, i.e.:

 fabien=# SELECT POW(2, -2); # 0.25

that is if exp < 0 the double version should be used, it should
not return 0.

Basically the idea is that the pgbench client-side version should behave the same as the SQL version.

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