COS:

• Coloured section of bar is the number of issues that have an estimate applied, uncoloured (line) section of the bar is the count of issues with no estimate applied
• Tooltip shows both issue counts and %'s
• Put in expanded Epic information panel unestimated and estimated

Testing Notes
Q: How will this handle filtered issues?
A: Ignores filtering

Q: What if there are no stories in the epic, or only 1?
A: The bar will not show for zero, will be small if % is small

Q: What if no estimate statistic is selected for the board?
A: One is always selected

Q: What if stories are removed from the sprint?
A: Not Answered

Q: What happens when the last one gets removed?
A: Not Answered

Q: And another one added after that?
A: Not Answered