(bug #223)
 - Added more detailed info about how to set up replication


support-files/my-huge.cnf.sh:
   - updated variable names that have been renamed in 4.0 (bug #223)
   - added more detailed info about how to set up replication (suggestion
     made by Guilhem)
support-files/my-large.cnf.sh:
   - updated variable names that have been renamed in 4.0 (bug #223)
   - added more detailed info about how to set up replication (suggestion
     made by Guilhem)
support-files/my-medium.cnf.sh:
   - updated variable names that have been renamed in 4.0 (bug #223)
   - added more detailed info about how to set up replication (suggestion
     made by Guilhem)
support-files/my-small.cnf.sh:
   - updated variable names that have been renamed in 4.0 (bug #223)
   - added hint and commented out sample about skip-networking option
     (security enhancement)