The bblayerlib module is designed to manage the conf/bblayers.conf file
and related actions.

It provides a common interface to:
   fetch-layers   - Fetch one or more layers from a remote SCM
   add-layers     - Add one or more layers to bblayers.conf
   remove-layers  - Remove one or more layers from bblayers.conf
   get-layer-info - Get a list of currently configured layers

TODO: