omit 0 lat,lon gps points

[jernejaMislej]

About
sometimes in case of errors in the gps or gps data processing, 0 lat,lon gps points are written in the final gps data used to geotag the images. these points should not be read in the tools, but omitted in case of external gps data, or in case gps already embedded in exif, it should be removed, so the images are skipped or interpolated with the correct gps if possible.

Notes
for external gps see here , particularly to clean the gps trace after this
for internal gps see here, particularly to expend this here

[ptpt]

Fixed in v0.8.0