Improvements in calibration from tarfile

Improved the script to calibrate from a tarfile:
1- Added possibility to set different calibration flags: number of coefficients, fix ratio, set zero tangent coeffs.
  This would help users to try different calibration settings with the same images, so he can get the bests results without spending as much time as before (bagging, replaying bag, changing parameters)
2- Rectified images and corners detected displayed after calibration.
  This would help users to see quickly if the calibration was successful and furthermore check if corner detection failed in some images and remove it from the dataset for further calibrations.

Tested with mono and stereo datasets.