More install/uninstall/install-strip updates:

More install/uninstall/install-strip updates:
- Don't install gzipped man page (Solaris again).
- Don't overwrite existing config files, and install new versions as *.new.
  Fix permissions/ownership here too.
- Better testing before removing directories.
- Some better messages during install, ie 'Preserving configs', etc.
- Better handling of install-strip to fix previous problem of trying to strip
  init scripts.
- Crude test for valid USER in case is set on command line.
- Force immediate exit on some errors (eg invalid group).