Duration corresponding to percent complete in percent complete tooltip

[GoogleCodeExporter]

Add new text to the progress bar tooltip.

When the user marks task's progress by dragging the black progress bar, there 
is a tooltip showing the progress percentage. Add new text to the same tooltip 
showing work done in days.
Example tooltip: "29%  5.2d"

Background:

When you work on a task, you most likely want to report amount of work done in 
days or hours rather than in percentages.

The current solution is: If you have a 15 day task and you used 2 days  to 
implement the task you first need to convert 2 days to percentages, which is 
13.3% and after that you can drag the black progress bar until progress has 
increased 13.3%.

The proposed solution is: If you have a 15 day task and you used 2 days  to 
implement the task you start dragging the progress bar and notice the initial 
amount in tooltip, e.g. 5d and drag until the amount in tooltip is 5+2=7days.

Remember that if you have zoomed out enough the Gantt chart, it shows weeks on 
the x-axis, not days and especially in this case additional text in tooltip is 
very helpful.

Original issue reported on code.google.com by [email protected] on 18 Mar 2014 at 1:53