* system/install/010-server-configuration: fixed variable expansion - changed apostrophe with double quotes.
* system/install/080-database-server: added LDAP authentication in PgSQL.
* system/install/080-database-server: created PgSQL superuser group 'labadmins'.
* system/install/045-ldap-database: install and configure LDAP database.
* system/client/ltsp/plugins/ltsp-build-client/030-gislab-ldap: client - configure LDAP.
* client: fix LOCAL_APPS.