Investigate how to create a SSH connection between clients and Dali

To avoid the problem we currently have of sending plain text or weakly encrypted passwords from Dali clients to Dali when authenticating access to files/workunits.

We should add the ability for Dali clients/Dali to support securely connectivity and a Dali configuration only to only accept secure connections.

Ideally the SSL connectivity would be implemented such that components could switch to using it relatively seamlessly, e.g. a implementation of ISocket.
In fact we already have ISecureSocket which is a derivative, however it is only partially implemented.

For Dali connectivity, MP would need to support SSL also.