gLite L&B setup script:

gLite L&B setup script:
- switch yaim to use the (sourced) setup script
- GLITE_USER, GLITE_HOST_CERT, GLITE_HOST_KEY not required
- GLITE_LB_LOCATION removed
- all defaults in the setup script now
- added Kerberos support (not launched by default)
- detect distribution and use that for the scripts
- configuration file in /etc/default or /etc/sysconfig
  (replacement for the profile.d and site-info.def file)
- hide other startup scripts output
- more strict check for L&B database, migration for L&B 4
- update msg-config script