LTM Popup - a few more improvements

... show also METRIC_BEST column in Rides List table, if such a curve is available 
... ignore METRICs which are not ride related (Estimates, Measures) in the Ride List Table
... add Info-Text if a Metric (like Estimates or Measures) was ignored (so that Users do not assume this to be a bug)
... consider that the Ride Columns table may only contain the Date/Time column (e.g. in resizing)