Filter gps noisy tracks

[PerroVerd]

When using the option draw lines between gpx dots sometimes we get a ugly thing because of bad tracks. A filter to not show lines if the distance between points is greater than x or whatever would be a great help. Maybe the code in osmtrackfilter would be helpful.

To have a clear idea of what im saying take a look at the raw data near 42,85266, -2,68212

[framm]

fixed in r587. You can now specify a maximum distance between GPS points for which lines are to be drawn (config option draw.rawgps.max-line-length, value given in metres).