* Now www/squid directory is common directory for squid packages.
* package options clean up and all options are described.
* LDAP helper support. (PR pkg/39386)
* DESTDIR support.
* Move some MESSAGE to documation directory.
Next, I'll import squid26, squid27 and squid30 packages.
- Move some common parameter to Makefile.common; squid's user, group and
data directory.
- Add LOGDIR to Makefile.common.
These changes have no functional change but make it possible for
squidGuard package to share parameters.