Gpx data can be edited

[SamR1]

Some gpx points are not correct, it would be interesting to be able to delete them by clicking on the chart (and allow user to export the new version).

[gorgobacka]

As an intermediate step: It would be nice to be able to crop parts in the beginning and at the end (similar to the functionality in Strava). I use this function often, because many times I forgot to stop the recording immediately after finishing my rides.