Clone binaries: document and add tests OR remove feature

[axic]

No description provided.

[chriseth]

I would actually propose to extend it properly once we have EIP5/8.

[axic]

I propose to remove it and we focus on #2296.

[chriseth]

#2296 needs a factory contract, this is basically the same thing without a factory contract, but yes, let's first focus on the other one.

[axic]

Do we agree to remove the clone binary functionality in 0.5.0 then?

One less unspecified feature to be maintained, so we can properly design it and reintroduce it.