Add sectiongroup name to instance id in error message.
Call BaseMassager.__call__ to get value, so the way the value is fetched can easily be changed in one place.
Ignore setuptools_git stuff.
Refactor config to massage values on get instead of load.
Prefix instances with conflicting names with the id of the master.
Add common BaseInstance.
Move add_massager into ConfigSection.
Make masters accessible by name. This implies that the names are unique.
Support per instance massagers.
Add new ``instance`` section group where you choose the master via the ``master`` option.
Set the path in __init__.
Add possibility to extend and overwrite configuration from other files.