Add alerting and getinfo_MP

Please see notes here guys http://pastie.org/pastes/9733526/text?key=luz9fdv1whtvfhn1sjvckg

Before merging can we grab an hour to build this and run over how it works/test it out.

Thanks
Z
I usually prefer static_cast<int64_t>(expiryValue), because it's explicit, but in this case there is probably no need for it at all. And FYI: Height() returns int, not int64_t.