Elegant tab progress bar for looping simulations
Elegant tab progress bar for looping simulations

In simulations with &vary_element specs, the simulation is run multiple
times while various parameters are varied. The progress bar now shows
the total progress of these simulations.

Also, everything in the _process_started() callback needed to happen
before the process was started (especially setting up calculations for
progress). So, the function contents was moved to the _run_simulation()
function just before the self.process.start() line.

radiasoft/radtrack,radiasoft/radtrack