Please rename cg-X* to something else

Hello!

Since cg-X* scripts are not supposed to be used by the end users, I suggest that we rename them so something not starting with "cg-" or even "cg" so that tab completion in bash doesn't show them. I suggest "_cgX" instead of "cg-X"

In the long term, the internal scripts should go to $prefix/share/cogito, but it would require generating other scripts from templates to substitute $prefix, which could be inconvenient at this stage.