Improvements

[gberaudo]

No description provided.

[fredj]

I've found a small issue with the delete interaction (click with alt key): an exception is raised when the segment is clicked instead of a control point. Patch to come

[gberaudo]

@fredj, I have fixed #2.

[fredj]

thinking again about the profile; what's the reason to store it at all ? can't we use the geometry instead ? (add elevation to the existing coordinates)

[gberaudo]

thinking again about the profile; what's the reason to store it at all ? can't we use the geometry instead ? (add elevation to the existing coordinates)

The profile is used with straight lines, which only have 2 coordinates.