Feature request: Communication between operator and delegate

[rodrigonzalez]

Member section where a delegate can send direct messages to the pool operator, and the operator can send mass messages to his or her delegates, which will reach the delegates as alerts or warnings.

The operator will not know exactly who its delegates are, but the delegates will be able to receive the messages sent by the operator, and if the delegate wishes to make a consult, he can do so as a direct message without the operator knowing the identity of the delegate.