Ability to easily clear knowledge base

[kkda]

In knowledge base menu, or maybe as an option when adding data to knowledge base.

Would be useful for debugging when editing data externally and re-importing with intention to replace all existing data.

If that's too destructive, it may be available only when debugging is enabled or only for certain users etc.

[seebi]

fo developers, we have a tool called owcli which can be used to script OW activities e.g. re-population of graphs.

https://github.com/AKSW/owcli/

I've added a make file in our data directory which uses that.

However, please juse create a new action in the model-controller similar to the delete action (and also available only if the user has access to ModelManagement)