Issue #399 : Sniffer can delete mark and probe ground

[piotrwalkusz1]

No description provided.

[Emxx52]

I think Sniffers shouldn't have the ability to check if the ground is flat the same way Me does it. Also, all kinds of robots are able to check flatness of the ground precisely by using flatground() function, so adding a special button is not necessary. Furthermore, it would probably make the astronaut more useless, especially considering the fact that we are going to implement Builders.

Please don't include this feature implementation in your commit then, as it was never officially discussed and accepted by our team.