Makes files and comments refering to install or configure variables up to date

Makes files and comments refering to install or configure variables up to date
at the install time. In 1.4-asun version, this was done by a special sed script
at install time. This was droped from Makefile.am files. I have reinstroduced
it in, I hope, a clever way and also used it for distrib/initscripts/rc.atalk.redhat.in.
This will enable us to use any paths at the configure and get the various paths updates
in mans, scripts and comments.