* Progress Tracker doesn't mark as "green tick" a step which hasn't been set in the flow. Steps behind the current step, which were not processed ('an optional step') are now marked distingishly as green crossed sign for shell and as minus sign for ssh.
* Finality Flow sets the current step to NOTARISING only if the actual notarization is performed.
- Existing embedded Shell connects via RPC including checking RPC user credentials (before was a direct use of CordaRPCOps): in dev mode when console terminal is enabled, node created `shell` user.
- New Standalone Shell app with the same functionalities as Shell: connects to a node via RPC Client, can use SSL and run SSH server.
