Improve User Manager to support long group names and lists

There are some glitches with long lists of groups or long group names for a user:
![image](https://cloud.githubusercontent.com/assets/1279510/22968740/efa3b812-f36b-11e6-8aca-0d6091193beb.png)

![image](https://cloud.githubusercontent.com/assets/1279510/22968711/d0147bda-f36b-11e6-936b-dfc5b58ee396.png)



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Improve User Manager to support long group names and lists #1453

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Improve User Manager to support long group names and lists #1453

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