signal-edit: Working with real cases

* Quite a lot of structural changes
* Works seamlessly with S3 now
* Signal samples added for test/demo
* Help works no matter if script is installed via s3 or run directly
* CLI help for interfacing to other scripts (top level)

Have been considering putting all this under XML. But fear it will be more
complex than justifiable. Endresult on target will be just a compact table. No
XMPL oarsing in run-time thank you, not for a high precision RT-tool. But could
possibly make structuring of data simples while editing and developing which
data needs to go where.

Cathehory: development