Removing sw area also require removing anything which got aliBuild inited

[ktf]

Due to the --reference cloning, removing sw makes anything checked out with aliBuild init break.

[ktf]

@dberzano

[dberzano]

So, this is intended to save lots of space for users cloning our main repositories (AliRoot, AliPhysics). Data in the working directory is not lost: removing .git/objects/info/alternates from the inited repository and running git fetch --all will fix it and make it independent from sw.

What do you suggest we do in such a case?