ROI improvements (rebased onto dev_5_0)



This is the same as gh-2269 but rebased onto dev_5_0.

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This PR adds "Font size" and "Line width" settings to inspector and also increases the max width of the comment box displayed in the various ROI figures.

![image](https://cloud.githubusercontent.com/assets/6575139/2642697/4da19d62-bf0d-11e3-81d5-c4234beac9f7.png)

@aleksandra-tarkowska