Fixed mapping for @CollectionTable in OnmsCategory.
Cleaned up Linkd context files since the classes support @Autowired.
Fixed runSingleSnmpCollection() so that it returns false if the node ID
cannot be located.
Fixed test for Hibernate4.
Removed unnecessary TransactionProxyFactoryBean usage.
Removed unnecessary header calls that caused infinite loops in Spring
3.1.
Updated some imports from Hibernate3 to Hibernate4.