Make it more clear that plotting has actually finished

[PeterParker]

Fit multiple peaks as per the example in Exercise 2 of the training course:

http://www.mantidproject.org/MBC_Exercise_Intelligent_Fitting

The progress bar in this case never gets past a few percent but still successfully completes the fit. We are shown the "Fit successful" message in the reports log, but one user has said that for those who don't have it open it may not be very clear that the fit has finished.

Could we make a "100%" call to the progress bar upon completion so that users have that extra visual clue as to what is going on?

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Keywords: student

[PeterParker]

This issue was originally trac ticket 8454