Setting up a robot

Adopted Carina's work with @doudou's comments. Could not resolve everything, but at least her effort is not in vain...
The environment variable is there to be used?

Why not use something simple based on the environment? Using `acd` is unusable slow (executing the whole ruby-stack just to change into a directory?), can fail on non-unique matches (what if someone makes a library called `bundles`? The resulting error-message itself is not trivial to understand) and frequently breaks (see rock-dev...).

Everyone with minimal bash-expertise knows what `cd $AUTOPROJ_CURRENT_ROOT/bundles` does. But understanding what `acd` does?