[Openstreetmap] New osm-editor with empty-track bug removed and auto-centring

[nick at hogweed.org]

> > All gpx tracks should be loaded as "OSM" now ,
> > otherwise
> > the program writes
> >
> > WARNING: Empty TrackSeg
> > No segments in track, so won't average
> >
> > even for the files from osm-editor repository.
>
> What I'll probably do is deprecate and remove the old Save and Open, and
> replace the GPX files in the repository with some "OSM" format GPX files.
> "OSM" format GPX files by the way are files where each segment is
> represented as its own <trk> tag; before, there was only one <trk> tag per
> GPX file.

I have now sent a further update to the repository which can *only* save and 
load in "OSM" gpx. I have also updated the example GPX files so that they are 
"OSM" GPX.

Nick