Added option to disable update at startup (debug only).
Added column series.
Update at startup is disabled for debug by default.
Renaming.
Linear series bug.
Menu strip re-ordering.
Updated column series color. Fixes menu items status.
Cleanup. Added comments.
Added menu shortcuts.
Change GUI font when renderer is changed.
Change GUI font when renderer is changed.
Added change to text annotation.
Complete new approach: download all values from new site to a file (.csv) and read values from the file.
Graph related changes.
Text annotation changes.
Updated OxyPlot.
Changed default URL. Removed old feed-reader. Added last date to graph text annotation.
Merge branch 'feature/historical_data' into develop

* feature/historical_data:
  Changed default URL. Removed old feed-reader. Added last date to graph text annotation.
  Updated OxyPlot.
  Text annotation changes.
  Graph related changes.
  Complete new approach: download all values from new site to a file (.csv) and read values from the file.
Work in progress.

Uses MoreLinq package. Added license info to About box.
Updates.
Updated OxyPlot
Updated x-axis offsets.