Prevent merge mined currencies using the same chain id from blowing up

[ericecook]

This should either be tested for on startup (if practical), or caught/handled in such a way that doesn't cause jobs creation to fail

[icook]

Can't really be tested for on startup, it should just be a caught edge case in job generation.

[ahmedbodi]

it should be able to. Call getauxblock and check if chainid is in a list of chainid's were using. Just like whats done with address versions on the frontend right?

[icook]

@ahmedbodi Definitely, just needs to be coded up.

[ahmedbodi]

Okay. will get this coded up and a pr submitted in a few

[ericecook]

@ahmedbodi did you ever create this?