Metacat

fixed bug - hardcoded LDAP URL

made use of the new property for ldaps url;
it is used for secure connection to LDAP server listening on second port 636 by default with SSL sockets;
it is used from Metacat for the authetication process only;
all the rest communications with LDAP server are made on the default port 389 with plain sockets

moved delete from xml_relation before delete from xml_documents
because of the parent-child relation b/w these 2 tables

fixed error with exception handling in metacat servlet and added new dtds to the sql script

changes according to bug# 234 - metacat accession # handling, done

changed all mentions of DBAdapter to the new name AbstractDatabase

changed all mentions of DBAdapter to the new name AbstractDatabase

rename the DB* classes to:
AbstractDatabase
OracleAdapter
PostgresqlAdapter
SqlserverAdapter

use the non-null function name from db adapter

included new function that returns db specific non-null function name