Creating & amending feeds - Beta interface - reorder rename dialogue

[borpin]

Please see community discussion https://community.openenergymonitor.org/t/new-beta-interface-creating-amending-feeds/9104

Specifically: The ‘Node’ is the group, so logically should be first. It would be useful if is presented you with a dropdown of existing Node names (prevents misspelling) and the option to add a new Node.