video: calibration file path

[nzjrs]

Yeah VideoServer is not getting initialized with the calibration file that I pass to it through the command line. If I rename my calibration file 'calibratedBallImage.data' and place it in the top level directory that I'm running flyvr-video from it doesn't have any issues reading and performing the warp. John - I think there is a bug in how VideoServer.py reads the calibrationFile. It seems to go with the default regardless of the file I pass to in via the command line.

was not fixed by 4a77bbb (need to investigate)