Improvements and fixes

A Janitza meter can now be entered as a data logger by hand. This year's Jahresmarktprämie now appears on the "Market" page as a running estimate per technology.

• On a plant's "Dataflow" page, "Add Logger" now accepts a Janitza meter entered by hand, without waiting for a network scan to find it.
• This year's Jahresmarktprämie now appears on the "Market" page as a running estimate for each technology, updated with every price update.