clear datasets on logout

[oganm]

Private datasets remain listed after logging out, causing issues with missing data when expanding

[arteymix]

There is a special string added to the state to indicate the group the current user belong to. When it changes, it should trigger an update.

[arteymix]

I can find it now, but the idea is to make the API request depend on the group of the current user by adding a dummy parameter to the query for the group he/she belongs to.