Main Clair logic is changed in worker, updater, notifier for better adapting
ancestry schema. Extensions are updated with the new model and feature lister
and namespace detector drivers are able to specify the specific listers and
detectors used to process layer's content. InRange and GetFixedIn interfaces
are added to Version format for adapting ranged affected features and next
available fixed in in the future. Tests for worker, updater and extensions
are fixed.
created table layer_namespace to store the many to many unique mapping of layers and namespaces
changed v1 api to provide a list of namespaces for each layer
changed namespace detector to use all registered detectors to detect namespaces
updated tests for multiple namespaces
Fixes#150
Sida Chen