0.8.4, spigraph tab, valgrind fixes, can add new fields using config file, overrride-ip section

* New SPI Graph tab which lets you graph an expression per field
* valgrind fixes and memory reduction
* Now possible to chose which http request, response and smtp headers to index using headers-http-request, headers-http-response, headers-email sections
* Added override-ips config section that allows overriding of country, tag, asn for ips and cidr ips