Added backend for proxy LDAP authentication

Signed-off-by: Daniil Baturin <daniil@baturin.org>
Added configuration templates for proxy LDAP authentication.

Signed-off-by: Daniil Baturin <daniil@baturin.org>
Web proxy LDAP auth: don't allow bind-dn to be set without a password

Signed-off-by: Daniil Baturin <daniil@baturin.org>
Add LDAP support to SquidGuard

Signed-off-by: Daniil Baturin <daniil@baturin.org>
Add templates for user-group and LDAP search in SquidGuard

Signed-off-by: Daniil Baturin <daniil@baturin.org>
0.2.110+hydrogen2