[pyagent] links
[engine] better logging
[jooq] mapper for simple table joins
[logging] add convert method for collections
[object] fix object serialization when there are multiple child relationships
[util] make ExecutionException have multiple resources
[system-task] logging
[object] add collection methods on DataAccessor
[model] links model
[packaging] delete network service
[packaging] unneeded file
[schema] links schema
[links] initial commit
[test] tests
[resource-pool] avoid NPE
[api] check for missing type

If you authorize a subtype without authorizing the parent type the class
will not be found and create a NPE.
[util] avoid NPE when resources is on set on ExecutionException
[tests] fix tests
[docker/agent-instance] make smaller
add api key