No option for manually calling reply function in pm.bind

[jonhoo]

It is currently not possible to manually call the method causing a reply message to be sent in a function bound in pm.bind.

This could be very useful when the function bound by pm.bind performs an asynchronous operation, and such cannot reply straightaway.

Could be implemented as such:
pm.bind_manual(type, fn, [origin], [hash])
And that fn then gets called with (data, callback), where fn calls callback when it has completed doing its job