Saving workspace functionality

Saving workspace functionality:
- the Dynamo receives a message about saving, saves all workspaces as files and sends them back to the Flood.

Part of changes that had to be uploaded with "Changing the way of geometry transmission" but wasn't:
- receiving a geometry message, process it and send back the geometry data

Enhancements of the code (there is not a lot of them, so I add them into this PR):
- checking for not null, correct guid, removing old code, etc
Actually I don't know why the function descriptor provides wrong number of ports. I just noticed that there are nodes with less number of ports on the Flood than they have in the Dynamo. That means the Dynamo sent wrong number of ports.