Help resolve WB-483 - Workbench hanging with a specific file: During testing,...

Help resolve WB-483 - Workbench hanging with a specific file: During testing, it was found that the file contained some invalid values (infinities and/or not-a-numbers) causing computations to produce invalid values and ultimately causing the failure of a loop termination.  Code was added to detect this failure (in chart processing) but there was no good way to inform the user of the problem.  The new event EventAlertUser is now used to convey the problem information to the user.