PATCH: add work agreagate function on int64 (1.1 beta7)

[sauron]

This patch add handle item with type number int64 with agregate function (max min & etc).

[Alexei]

Thanks for the patch. We will review it and apply to the latest code if everything is OK.

[sauron]

It not still added in zabbix.

[iceman]

if anyone can use it, i modified saurons patchfiles for beta 9.

and thanks sauron for your work ;)