Issv3: add xmlrpc hub apis

[CDellaGiusta]

What does this PR change?

Adding some missing XMLRPC entries for HubManager

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No difference.

• DONE

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• API documentation added: please review the Wiki page Writing Documentation for the API if you have any changes to API documentation.
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Test coverage

• Unit tests were added
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[mcalmer]

Also this is missleading as it sound like you would call it on a hub and it connect to a peripheral server to get the data.
But hubManager.collectAllChannels() just get the local channels.
I think we need to check if we need this at all for any workflow which makes sense to develop via API.

[mcalmer]

To make sense out of this we should specify the peripheral server and return all channels from that given peripheral.

[CDellaGiusta]

restructured