Small-Plot - wrong Axis Scaling and Labels

... wrong Axis IDs causing the following problems
... X-Axis - not considered "time", but "Altitude" as scale (wrong label/wrong scale)
... Y-Axis - altitude curve not properly scaled (mix with X-Axis
... use similar minimum scale for altitude like AllPlot (so that flat rides don't get overscaled)
... attach Alt-curve first (to be in background)

(SmallPlot - used/tested at HrPw window, Split Activity Wizard, Merge Activity Wizard)