Cleanup-utils use clean- prefix for auto-complete.

To simplify looking for the cleanup utils through the use of autocompletion the prefix clean- groups those which otherwise hold no commonality.

Not sure where this commit got lost.
One missed the pear install --soft fix.

The pear itstall fix @c12030f638 lef this little one out, making him part of the gang again.
We're on master now so do update from master.
Composer search was missing from our composer support.
Make backup of Makefile don't just overwrite.

This should've been done looong ago, countless improvements have been lost this way.
Now who is going to clean-up this mess?

Before long someone will get the blame for loads of Makefile.bak.n files all over the place. Before that day comes here is the responsible thing to do.