Roeland Jago Douma cf0501d632 Make the group backends also possible using interfaces ... Just like for the user backends the group backends should also be properly done using interfaces. This adds the interfaces and abstract class to get started Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>		2018-04-23 11:49:28 +02:00
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Backend	Make the group backends also possible using interfaces	2018-04-23 11:49:28 +02:00