Handle output path for estimateVelocity program
Handle output path for estimateVelocity program

Now one can specify output path where files with effective velocity
calibration will be stored by providing third argument through command
line to the estimateVelocity program.

JPETTomography/j-pet-framework-examples,JPETTomography/j-pet-framework-examples,JPETTomography/j-pet-framework-examples,JPETTomography/j-pet-framework-examples